Unsure if the 3.8L and 5.0 share the same bolt pattern. I know 94-95 5.0's and 3.8's have different bellhousings, so you may have to pick up a 94-95 5.0 t-5 bellhousing. The t-5 from your car is actually rated at 300 ft-lbs which is stronger than the T-5 availble in 1985.
Don't use the 1985 flywheel. It's a 10" flywheel. You'll want an 87-95 5.0 flywheel and a 10.5 clutch.
You'll also need to revamp the fuel system to a carb-style setup, change the fuel pump to a lower volumn pump, run new fuel lines and bypass the PATS system i beleive in order to start the car with much of the EFI engine harness removed.
Hopefully you can handle such a project