From what I understand mod blocks all interchange so head gaskets should all be the same. Yet RockAuto lists a crap load of different gaskets for different cars. Marauders are shown to use same gaskets as Crown Vics and most other 2v and 4v engines. Yet if I look at Aviator and Mach 1 they are shown different gaskets. Terminators, yet another gasket. 97-97 Cobra yet another gasket.