Does anyone know of a good site that would be helpful in the conversion of a 1989 TPI from a TransAm to an early 70's 350 sbc? A description of what is needed, what can be deleted would be great. I would like to use the wiring harness from the donner car, I have everything.

Lots of info on this topic at www.thirdgen.org Message boards.

Thanks, I was in a few string sites such as you mention but they are great for specific problems if you spend enough time searching around. I am looking for a site that follows a complete conversion through and has lots of info for a novice.

Wander down to Barnes & Noble (or amazon). There are books on it.

i am doing this right now. After searching for hours and hours i have not found a good site. chevythunder.com is a good start.

A description of what is needed, what can be deleted would be great. I would like to use the wiring harness from the donner car, I have everything.
You will have to use everything from the donor car as it is ECM controlled, including the dist and knock sensor above the starter.

You could bypass the EGR valve with a plate, however, it would run just fine. Be sure to check/change the EGT sensor attached to it and its circuit back to the ECM.

You can delete and is advisable to remove water heating of the throttle body. Hopefully, your donor is a Speed Density system and not a MAF System. If it has a MAF sensor, you'll need a tight/no leak intake hose between the MAF and the t/body.

Take your time and study the book and make pictures of the donor car before the transfer. TPI systems work great up to 4500-4700 rpms.

...Hopefully, your donor is a Speed Density system and not a MAF System...
Personally I like the MAF setup better. If you make changes to the motor to improve the volumetric efficiency, the MAF sensor will measure the change and alter the fuel injection to match. On a speed density system, the ECM is calibrated to the VE of the motor. If you change VE, you have to change the ECM program to optimize the performance.

i just got done doing that, i used an 85 on top of a 75 350. having trouble working out all of the bugs but it does run just not as well as it should. i can unplug the #2 & #4 injectors and it will run great. looking for help now to smooth it out. it will run great when tuned up tho. cant wait.

Personally I like the MAF setup better. If you make changes to the motor to improve the volumetric efficiency, the MAF sensor will measure the change and alter the fuel injection to match. On a speed density system, the ECM is calibrated to the VE of the motor. If you change VE, you have to change the ECM program to optimize the performance.
Good point, Dave.