I know that the 91 tpi was speed denesity and 87 was MAF, but the only thing that cares about that is the intake and computer right? I'm buying a 91 350 out of a formula 350 and putting the tpi unit from my 87 305 tpi on it. Besides 22 or 24 lb injectors and a chip what else do I need? The set up is going back into the 87 Z28.

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87 Z28 305 TPI, Auto, LT-1 cam (@.50 418/430, 194/199, LSA 111), roller timing set, 2.73, Gutted air boxes, K & N fillters, Dyno Max 3" cat back, 8.8 mm spirals, air foil, BFG Drag radials, and 170* Stat.
Old Best 15.414 @ 87.47.
new best 15.006 @ 89.55.

“Fallen But Not Forgotten”

 

You will need a 350 computer or at least a new PROM to get the A/F mixture right, among other things. I would also go with slightly larger injectors so you don't have to change them when you mod out the new 350.

 

Well you also need to change your oil sending unit on the 91 engine, from the bottom driver side to the top, back side of the motor...your brackets to your a/c on a 91 is diferent than whats on an 87, on my 86,87 water pumps were slightly diferent than the 91, if you are going to use the 87 brackets you will probably have to use the 87 pump...91 had the serpentine belt which did not need bolt holes on the water pump for any brackets...I just made the same change over on my 86 T/A good luck! I made it happen