Nope. 400s have a huge bore. No way to bore out a 350 that much.
400s have a 4.125" bore. 350s have a 4.00" bore. You'd get about 0.080" of overbore in the 350 before you suddenly realized you have cut into the water jacket.
Not only the bore is 0.125" larger than the 350 ci motor, the center to center of the rods are difference ..
The 400's used a 5.56" where as the 350's was 5.7 ...
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