I'm not sure where I need to post this but here's my deal...
I've bought a LT1 throttle body for my 86 tune port.

before you ask, I bought it b/c it's a 58mm and I like the progressive throttle linkage that the LT1's have. And I also got it for a good deal.

Complications...
The two sensor adapters are different
-IAC adapter
-TPS adapter
-Throttle cable
-TV cable

I'm not worried about the throttle cable and TV Cable, I can may them work.
I don't know much about the IAC plug and the TPS plug. I may be able to swap the bottom piece with the IAC, I'm not sure. I don't know about the TPS.

Has any body done this before or can anybody help me?

 

You must have one hell of a motor to be using a 58mm throttle body. If you're under, oh, 500 horsepower, you're going to find that the 58 doesn't improve performance and will most likely hinder it.

But anyway... there was a thread a while back that will answer your questions. Try doing a search. Somebody put an LT1 tb onto a TPI car. I believe the wiring for the TPS is the same, so you can just splice. I'm not sure what was done with the IAC, but I don't recall them being different.