You will need the engine and computer wiring harness out of a 94-95 5.0 Mustang and computer. Your engine would also need the accessory mounting brackets for a 94-95 94-95 5.0 Mustang. Some of the swap is bolt on stuff and other parts may require some electrical skill on your part to make it work.
A simpler path would be some PI heads from a 99 or later 4.6 engine, or an engine and computer from a 99 or later V8 Mustang. Look around, you might get lucky and find a Cobra or Terminator 4.6 engine and computer.