So far the list that has been stated (with some changes):
New
tranny
Fabricated motor mounts for sure
Entire exhaust system headers and all
A radiator that will fit
Suspention
New Rear end - so change to the GT rear + diff
Drive shaft
100% custom wire job - have fun with that
Computer modding will be needed for sure - maybe custom comp.
Maybe you can get rid of the fuel injected and change to carb
Thats all I can think of but as how to do any of that well some you can do but the rest you better know some peolpe or know how otherwise your getting out the wallet.