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Will a stock small block Chevy 400 crank fit in 350 block?

No, a stock small-block Chevy 400 crankshaft will not fit in a standard 350 block. The 400's crank has a larger journal diameter than the 350's. You would need to have the 350 block machined to accept the larger crank journals, which is a significant undertaking and may not be practical or cost-effective.