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That 250 degree hard coolant line between the intakes seems awful hot to me. The valve should close when the temp gets up to operating range. That's for cold weather starting. I bypassed mine so no hot coolant flows through there. My domes are cool to the touch now although I do have a ceramic coated header that took a lot of heat away. You could check the float chambers when it won't run by trying to see if the floats are buoyant in the fuel by sticking a small red straw down the vent bung. If the chambers have fuel in them that straw should be "bouncy". Move up and down with the float.

Have a hose pipe on the ready at least, of course an extinguisher would be #1 but when they're empty you might as well throw it through a window. Gas isn't that bad. I've siphoned a 100 gallons over my life and drank at least one half of a gallon. It may cure covid like drinking Clorox? If you back it up on ramps a 5 gallon bucket or 11 (57 gallons ) would slide in and out easy.

I did my 280 first then a 240 after I got the steps all worked out. No problems and it's been 10 and 6 years respectively. Turn the tank upside down vertically with the fill hole at the lowest point and in a 5 gallon bucket. It all drains out. I ran some welding wire through the vent tubes to make sure they weren't stopped up. The first time was a nerve wracking experience but the next one was much easier. I'd quit my job and do it for a living if I didn't live in Bumble Snot Alabama.

Get a tub from walmart. Tighten the plug when it's close full and pour it up in jerry cans for your lawnmower. Read over this. It really was a big help for me. atlanticz.ca/zclub/techtips/fuel/gastank/index.htm

I'd get the restored tank. Cost was over $100 for mine then the headache of doing the job within the time windows. It was a hectic job for sure then it needs to cure for about a month. I used Red-Kote from damon products. The instructions are online if you want to read over them.

Put enough ketchup on it and we'll eat anything.

Restaurant Mazenburg is closed now. Do the Dutch not eat chess playing horses any longer?

Same with me. I bought all the fuel hose from O]Reilly's and did the 180 with two 90 degree brass PEX fittings. Cost about $50.

I wonder if it's possible to flip it over and use the other side? It may be fresh and useable?

That looks like you could have it resurfaced? My machinest measured the depth around the friction disc's screw holes and said there was enough for a light cut. Hopefully your's is too. Well maybe you could just get some shorter screws. Looks pretty shallow on some???

Check to make sure the motor mounts seat down correctly. There's some that don't let the peg line up and drop down into the hole. I used a rope and a wooden handle to fit up the gear shift hole to help pull the transmission up from inside the car. When I got it up where I wanted it I tied the handle down onto the tunnel inside the cabin to hold it in place. This picture may help...

She paints iconic cars with their people. James Dean, Janis Joplin, Paul Leonard Newman etc.

That's Edgar Winter.

Yes sir it is. The ZXs weighed a good bit more with all the added creature comforts for the female market they hadn't broken into yet, or so I've read.

Mine stays at 173F idiling in it's garage. Good flow at the radiator hole on top when I rev it up. No wind flow other than the stock fan with a full shroud off a ZX pulling air through the radiator. Water boils at 225F way up here in North Alabama where I live and I run 75>25 coolant and distilled water I collect from a dehumidifier running downstairs where the Zs are. 195F doesn't seem that high to me but I've always heard 200 to 225F is not good. Maybe do an IR temp check at the bottom radiator hose where it connects to the radiator and then get a reading at the thermostat housing to what kind of job the radiator's doing. Do the same where the in and out are on the block. That way you'd know if it's the radiator or the block I would think.

I took my 280 to the local grocery store where I found a Porterhouse for $10.99lb and that's cheap around here. 240 gets it's turn Sunday morning to de glaze the brake pads.

My Dad used this stuff a couple of times so I guess it worked for him anyway in old El Caminos? Says not to use in aluminum radiators though. https://www.amazon.com/Permatex-80030-Heavy-Radiator-Cleaner/dp/B000HBGHPY?th=1

Is it grounded good, nice and shiny on the bolt that holds the bellhousing to the block?

New info. You may have some kind of air in the system if it started with the new rad? I'd let it run, idling, until you see flow under the cap. Rev it up pretty high and let it burp. Then top it off. Goodluck!

I've had to use an air compressor to clean my radiator in the beginning of grass cutting season down here. The lazy guys blow the mess into the streets and it gets in my air filter and radiator

Spray bar or self oiling cam? Odd circumstances. If DSI did the head I can only think it's a leak. Metal expands when it gets hotter, right? Head scratcher!

Is the small wire on the solenoid on good and tight? Simple minded me thinks it's the starter. But the smarter guys know about all the safety switches and all that crap. Is it the original starter as far as you know, I guess it would be a Hitachi? or reman? I've bought some junk alternators and starters from Advance, sold as good but noooooo.

Sounds too fast to be an exhaust leak, it kinda keeps up with the valve train??? Have you tried the hose listening trick yet, poor mans stethoscope?