Zed Head

That's not good. This thread might be interesting.

Not sure why you're responding to me. Digital signals are possible. He said that he didn't think the GM sensor would work but he didn't say why. You've extrapolated quite a bit, from the whole thread. I had one post to work from. Still, an interesting discussion...

Here's an old discussion. The guy had the same two first initials! Solution about post #11. The Pertronix and 123 modules work in a similar way.

Might help, I think there's a clearer version out there somewhere.

Yours has the current sensing tach. I can't remember the details but people have found that fiddling with the white wire loop on the back of the tach can solve those types of problems. I think that CO has even had comment or two about it, but it was years ago. Which 123 are you using. and which coil? I think that the latest ones would pass more current than the old stock setup. Maybe the tach is seeing too much current.

So he's not hiding anything. He just doesn't know that the direct side shot is a good one.

Are we talking about the same car? Not seeing therm. https://bringatrailer.com/listing/1978-datsun-280z-86/

There is, or was/were, a kit(s) for swapping in a Chevy engine. But once you drive the L6 you might change your mind. Get it running first and try it out. Nobody has ever said that they wasted their time learning how to use a multimeter. It's a must-have skill for DIY stuff. https://zcardepot.com/collections/ls-v8-swap http://www.brokenkitty.com/zcar/zcar.htm

Mine was much worse. His isn't bad, one small piece. It has the typical gouge marks from the seatbelt latch. Looks like somebody was loading rebar.

Just post on the main forum. You'll get more better ideas. Somewhere out there on the forum is a general guide of things to check before trying to start these old cars. The fuel system needs to be clean and rust free so that the pump and injectors don't get filled with rust and bad fuel. And knowing how to use a multimeter is very important. You'll spend a lot of time just checking electrical things on the EFI systems. Post a picture of the engine for starters. We'll see if there's anything missing or suspect, and can point out other trouble spots, like the distributor. And, after that many years, the clutch and brake hydraulics will probably be shot.

Actually, there is one, just one, that is close. But shots from both sides, straight on, can answer a lot of questions about a car's body work.

The first lines I typically notice on a Z are those around the doors. Everything else needs to be adjusted to fit after those lines are set, I think. You can't adjust the two door jambs. The guy in the 78 BAT listing right above your post might be hiding those lines. None of his pictures are directly from the side. Here is the other 78 from post #556. The gaps are even all the way around the door.

The Indian looks interesting. The Datsun would actually be a Nissan 280ZX. Lots of help here if you want to get it running. These documents will help too. https://www.classiczcars.com/files/category/14-280zx/

More silver. Another 78. One just sold for $29,000, above. Might be too late, the market is saturated. This one has had a recent oil change though. And it has the mini towel bar, for the one next to the sink. And a rear luggage rack. https://bringatrailer.com/listing/1978-datsun-280z-86/

How about a picture of your pile of parts? Before and after is always good to look at.

Silver 78 is up today. Already at $21,000. Sold for $29,000. Not bad for a big bumper car. https://bringatrailer.com/listing/1978-datsun-280z-85/

This is probably a better forum for reassembly, I'd think. No offense to HybridZ.

You misspelled forum.

The UV problem happened again in the late 80's. All of those old Ford and Chevy trucks you see with gray primer showing after large pieces of paint peeled off were because of a change in the E-coat chemistry. It was actually UV light passing through the coating and degrading the bond between the coats. Everything you wrote sounds familiar, just about ten years too early. It would be good to see some history showing what, exactly, Datsun was doing on the 240Z's at the factory. A second clear coat on top of wet base coat would be different than a clear coat on an already baked base coat. I think that 73 has a more modern clear coat applied than any 240Z ever had. It's not a "period correct" paint process. Today's clear coats would be thicker than the wet on wet clear. I still think that 73 looks too shiny. Too "wet".

I used to work for a company that made paint materials. One reason clear coats became really popular in the 90's was that they could hide a lot of base coat defects. Water-based coatings had orange peel and without the clear coat it was very evident. If you look closely at most new cars' paint you can see the orange peel under the clear coat. Look at your reflection in a door panel and it will be wavy and distorted. But the surface looks shiny and smooth.

I can't find anything definitive about what Datsun/Nissan was doing but my understanding was that clear coats weren't used in high volume until the 80's and mostly on high end cars. I remember guys getting clear coats on their hot rods in the late 70's but that was a custom paint job. This article suggests that the late 70's/80's was when they really came in to high usage. https://www.paint.org/coatingstech-magazine/articles/brief-history-automotive-coatings-technology/ "As previously discussed, thermoplastic acrylic lacquer automotive coatings, given their excellent appearance, were the major automotive topcoat used in the 1950-70s. However, these lacquer topcoats did have one significant drawback: they had weak exterior durability. After about one to two years’ exposure, the coatings would begin to degrade, and aggressive waxing was needed to “bring back the shine” of these systems. By the 1980s, the automotive manufacturers were requesting better durability for automotive topcoats, as consumers were now expecting their cars to last at least five years, and they wanted the car to continue to look like it did when they first saw it in the showroom. " This Toyota page shows a clear on a solid as a one step/one bake process in 1973 but no clear top coat again until 1990. https://www.toyota-global.com/company/history_of_toyota/75years/data/automotive_business/products_technology/technology_development/materials/painting/index.html

The BAT crowd seems oddly excited about it, but most of them are just talkers/value pumpers/fans. I think the shine on the paint is from a clear coat. That's what clear coats are for, but Z's did not have them back then. Here's the silver 71 for comparison. The shiny 73 is already $1000 more. You never know until the last two minutes though. https://bringatrailer.com/listing/1971-datsun-240z-164/

The yellow arrows confuse me! I'm just a primitive cave man...

Too shiny! That's the third silver Z up for sale. I'm betting on originality for big money.

$17,000 for the 83 ZX Turbo hooner, whoosh, whoosh. https://bringatrailer.com/listing/1983-datsun-280zx-turbo-12/