I just got a new ride and I need some help with the details. It's a 1983 Mustang but some guy stuck a 502 in it 3500 miles ago. The car is in decent shape, but I don't have a clue what transmission is in it, rear end, or how in the world they got that 502 in there. Anyone have anything that could be helpful for me? It goes like stink, but I don't want to break anything.