ok I think I have read every post on this board and I am still lost and about at my wits end..
I have an 87 firebird that I put a 350 carb engine also have a 89 Iroc 305 TPI ....I took the TPI off of the 89 and put it on top of the 350 I used the wiring harness from the 89 and also the ecm ...now my question is is there anything that I am supposed to repin or splice ...or will that setup even work?

Did you also get the interior wiring for the 89 TPI? You will need it for the VATS system.

ok you mean everything behind the dash right I can get and what replace the one in the 87 with it ?

Yes that is what I mean because the 89 had the VATS system and you will need the VATS control module, the starter enable relay and the lock cylinder in the steering column if you are going to use the ECM from the 89 unless you have disabled the VATS in the computer.

eww ok would it be easier to disable the vats in the computer

you know it trys to start right now as it is with just the engine wirng harness but just dies as soon as starts to start buts thats probably why cause i don't have the vats system hooked up right?

ok i only need the vats system right i mean cause evrything else for the dash and stuff will not match up to the dash on 87

ok what if I was to get another ecm with a different prom say one for an 87 TPI would that work ? sorry I'm just kinda stupid when it comes to these things but I really do need this car running Iknow I should have never messed with it but I'm to far into it now to go back so anyonecan help or has anyadvice I'm all ears thanks Terry

ok I got it all figured out and its running .......

Thanks again for your help Trickster

You Da Man