Bought a professionally rebuilt L28 engine today. I hadn't planned on buying it and instead planned on rebuilding the L24 I had in my Z but got a great deal and couldn't resist. Now I have a few questions so I figured I'd ask all of the experts here. This place is a goldmine of information.

Anyway, I have a 73 240z with an L24 block and E88 heads. It has a 71 intake manifold on it with 71 SU carbs. The new engine I bought is a L28 with N47 heads on it. I have the fuel injection to go with it but I'm debating whether to just put my 71 intake and carbs on it (I prefer the carbs more than the FI but I'm on the fence at this point whether I should go carbs or FI). I think the intake manifold and will bolt up directly to the N47 heads. What was interesting to me is that the exhaust ports on the N47 heads are round whereas the ones on the E88 are square. I'm assuming, regardless of what I do with the FI/Carbs, I need to get a different exhaust manifold to fit the N47. Can anyone confirm this?

I guess my question(s) is basically what would you recommend regarding the carbs/FI and are there any issues that I need to keep in mind when putting the L28 in instead of the existing L24. I also assume the tranny will match right up but can someone confirm this too?

Thanks for all of your assistance.

While the caarbs are simpler to diagnose in the case of trouble, the EFI is more of a "turn the key and it runs right every day" situation.

Setting up the 2.8 with your carbs shouldn't be too dificult(check Brian Longs Datsun Garage), and will keep the engine compartment looking stock, setting up the efi means you will need to mount a highpressure fule pump, and modify some plumbing, mount the ecm and cut a hole in the firewall for the harness to pass through, mount the other parts of the efi system(injector resistors, fuel pump relay, AFM, ...)

If you plan on driving the car every day, the reliablity of efi is hard to beat, but if you want to keep the car looking stock, the carb setup will definitely work.

Will

I have '71 carbs mounted on '72 manifolds on an L28 with a round-port P79 head. All your carb parts will bolt up just fine, but you will need a round-port header or exhaust manifold.