So, I'm collecting parts for my 79 L82 350 speed density TPI conversion. I need fuel rails, distributor, plenum, throttle body, throttle linkage/pedal and wiring harness. I see the 89 and the 90-92 plenums are the same, can I use 89 distributor, throttle body, fuel rails throttle linkage/pedal, and wiring harness as well as the 90-92 versions?

Also, I understand the only difference between the 305 and 350 TPI systems is the size of the injectors. But I see in the link below GM had different part numbers for the 305 and 350 fuel rails. Can I use fuel rails from a 305 for my 350 build?

http://www.chevythunder.com/
(TPI swapping into an older vehicle fifth page)

17089024 1989 5.0 Rochester
17090100 1990-91 5.0 Rochester

17089025 1989 5.7 Rochester
17089026 1990 5.7 Rochester
17080101 1990-91 5.7 Rochester
17080102 1990-91 5.7 Rochester

 

I found another source that says the 89 plenum is unique to the 89 and the 90-92 plenums are the same. Not sure what to think now.

 

That may have something to do with the psi of the regulator.
The plenums have a few differences, cold start inj, 85-88, 89 no cold start and still maf, 90-92 no cold start inj and has extra vac port and mount for the map sensor.
May be a few other little things but those are the big ones.

 

Thanks TTOP350.