If your interested in using a rear mount IC I may have something for you. I did what your talking about. Its really not too hard although making everything from scratch took a while. First, I took an 84 intake and welded shut the inlet from the stock intercooler. Then I opened the entire bottom of the intake and milled out the dividers so that the entire intake became like an 86/87. Then welded a 2 1/2" inlet right where the 86/87 dog house is. I put a stretched rear mount in and "clocked" the turbo forward towards the intercooler. The throttle body remained in the stock position and was opened up to Lee Thompson's specs. The setup ran very well. Quite a change from the normal setup. I'm working on my Stage II powered Cobra and have parted out my GN. If your interested in this setup I have it all EXCEPT the stretch IC. But you can run a stocker with it or even a front mount. It doesn't really matter as the key to the power is the intake manifold, Throttle body and IC. Oh and I've got a really nice 3" down pipe and header setup also. The headers were just Ceramic coated so they are as new.
Bob