Mike Combs said:
Unless you get lucky and find a great deal, I would suggest a 4.6l DOHC(not the SOHC) out of a 93+ Lin Continental or late model Mustang. The put out 280-385HP depending on the year and model and will last a long time. The SC engine only puts out 210(89-93)-245HP(94-95) and are prone to failure. Either engine will require the transplant of the computer and wiring harness.
Good Luck!