tpis says in there most frequentley asked questions that the only difference in the two engines are the injectors and the prom is that true.

 

This was discussed a few threads below, under "Going TPI". Check it out.... that should explain a few things, and if not you'll be able to monitor the great knock sensor debate... For that matter, I say they are different between the 305 and 350.

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Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil

15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!

http://www.geocities.com/transam85tpi/

 

If you are talking about the injection system itself,then yes the only differences for the same year TPI are the injectors 19lb for 305's,22lb for 350's and the PROMS are calibrated different.As far as the engines,besides displacement,their are numerous differences like cams heads pistons etc.

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1990 Trans Am GTA,Black/Black Leather,350,auto 3.23,Dual Cats,SLP Package,SLP Torque Converter/Shift Kit,Fastchip,GSC's,
G-tech 0-60 5.1 1/4mile 13.6@104
Previous Thirdgen
1986 Camaro IROC-Z

 

45 cubic inches