I currently own a 1986 T/A with a blown 305 TPI perimeter bolt engine and I have a 1987 4 barrel CARB center-bolt 305 engine to replace it. My plan is to install the 1987 center-bolt engine with the original 1986 TPI system. That way I'm hoping that I don't have to deal with any wiring changes. Are there any major factors that I have to take into consideration ??? I understand that the original 1986 TPI manifold can be modified a bit to make it fit on the 1987 engine. Or should I just get an '87-89 TPI intake manifold and throw it right in there with no further modifications ?? Any opinions will be greatly appreciated. I need to do this soon. Thanks.

 

I can't believe none of the experts have a reply for this question unless the answer is already in some other post. Come on ,somebody give me an opinion. Thanx.

 

You are correct, this has been discussed here a bazillion times, but to answer your question the center bolt holes on the 87-up heads are drilled at a different angle than the 86 heads.
The intake should line up properly but the 4 center bolt holes will need to be modified, and you may need to shim the bolts, but I'm not sure about that.

 

So besides the modification of the intake manifold , the rest should be the same. Don't need to adjust anything different as far as using 081 heads with the '86 TPI system ???? Yhanks for your answer though,appreciate it.