I have an 86' Iroc w/5.0 TPI with 180,000 miles. Needless to say it's about time for a new powerplant. I like the ZZ4 crate engine from GM Performance Parts. Has anyone done this swap? What about emissions and ECM issues?

 

I work with a guy who did a ZZ3 swap (basically the same engine). Since this engine likes to rev, you'll need to consider a better intake base and shorter runners to let it do its thing. A larger TB and adjustable fuel pressure regulator would also improve performance. 22lb injectors are standard 350 fare, but you can get by with your 19's with higher fuel pressure if they're in good shape.

He went with a custom PROM to try to optimize things. You'll also want improved exhaust flow, if you haven't done that already. With all these things, including shaved heads and an even more radical cam than what came with the engine, he passed emissions this fall (he's equiped it to be like a '91-'92 350 TPI).

It is all possible. But, it isn't cheap to get it right. I believe this guy has somewhere around $8 - 10k in his upgrades so far, and isn't finished yet.

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82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.