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I have a 1982 cj7 with 4.2 6 cyl and I would like to know if I could replace the engine with a 1993 4.0 6 cyl. But I do not know if my intake manifold will work on the 4.0 engine. Does anyone know if the head and block are the same from 1982 to 1993? Also what all would you have to do to swap...