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Will heads off of a 400 fit 350 Chevy?

No, cylinder heads from a 400 small-block Chevy will not directly fit a 350 small-block Chevy. While they're both small-blocks and share some similarities, the 400 has a larger bore spacing (4.00" vs 3.800" for a 350). This means the bolt patterns and valve locations won't align. You'd need to modify the block significantly, which is not practical or cost-effective.