Well...... Your best bet at this point would probably be dropping the pan.... again.... and replacing the oil pump, and pickup assembly. You probably lucked out due to the fact that you didnt drive very far on it, and the fact that any of the plastic/goo and garbage that got sucked thru the pump pickup screen and thru the pump would have gotten stuck in your oil filter. You will definitely want to do a new pump because if the pump was starved of oil the gears inside pribably got screwed up, not to mention debris that may have gotten caught in the pressure relief valve on the pump. Change the oil pump, pickup, and do a fresh oil change and filter and let us know where your at.
You might be suprised, I think ull be alright. The oil filter was most likely your saving grace in keeping all that crap from going into the pressurized oil areas on your top and bottom end.
01 Mustang GT 5 speed
03 Mustang gt 5 speed