If it were me I'd put a cobra 32 valve 4.6 in it. It makes more power than the 5.4 With the 32V 4.6 you could put it underneath the stock hood. If you go with a 96-98 cobra motor you can use your stock fuel system and just replace the pump. The 5.4 is going to be more of a PITA to do the swap because of the lack of aftermarket parts.