Welcome. Glad you joined. Welcome got a good project up ahead.
First the trans swap has been covered by Sleepinc. It is in the tech section.
2. I would find a turbo donar car if it has a 5speed alread that would be great.
3. Would need to find a 2.3efi Mustang to get gas tank, fuel lines and wiring to the fuel pump or put a external pump on your tank. But you will have to run a fuel return line to tank. That is reason for 1st recommendation.
4. Wiring on this swap is the hardest part. Probably easiest way is a efi non airbag Mustang engine harness and repin for the vam. Or could use the donar wiring harness this may or may not be the best way. A donar Merkur or 86 or older turbocoupe yes. But the 87-88 harness is a mess but it has the best computer and vam. But these last 2 items are easy to get on e-bay.
4. Search Foxgt he has a long post on doing this and pm when serious he could give lot of advice.
5. Read and reread this may help or totally discurage you.
http://www.turboford.net/ubb/ultimat...c;f=2;t=046010
Like always here to help. Maurice