Personally I’d build the 71 455. You have it and it is plenty strong. Way cheaper to use the factory 455 crank and just buy rods and pistons. The end result in power and reliability will be the same only a lot cheaper than buying a 400 block and a “stroker” crank. The factory crank is probably stronger than the new cast cranks anyway despite its age. And there are all the parts that readily bolt right on the 455.
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