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i'm sure i could find the answer if i searched, but i'm already late. anyway i need a crank for a 78 400 and i found a guy who will gve me a running 400 from a 86 cheap. want to know if the cranks are interchangable. the 78 block is already machined and ready to go. i just have a 351m crank and would like to make it a 400. thanks in advance for replies.