The 5.0 Mustang and the SC AOD's the same specs in the service guide, with one (major) exception. The 5.0 has the "B" overdrive servo and the SC has the "A" servo. You must have the "A" servo with an SC.
There are a lot of performance AOD builders out there (LenTech, Art Carr, Performance Automatic, TCI, etc.), and it really depends on what you are looking for. I have the TCI "StreetFighter" in my '92, and it has more than enough pop for my daily driver. (It is fun to romp down on it and have the tires chirp when it grabs 2nd gear...)