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You can buy main bearing spacers at most speed shops that will allow you to use standard 350 bearings. Use the 400 pistons on the 350 rods and the height will come out pretty good. You'll lose about 3/4 of a compression point in the destroke, so use a piston that is appropriate for what you're trying to do.

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Q: What would it take to put a 350 crank into a 400 small block?
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