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I thought you had to have some kind of a shim between the block and bellhousing to bolt in a 429 where a 351M was located, something about the torque converter going in to deep in the block?
not sure...never did anything with big blocks. But my brother got a 351M C4 bell that he used on his C5 he built for his 64 fairlane 460.....
and My buddy used a 351M C6 case to build his transmission for his 557 big block mud truck used a 460 flex plate and converter with the engine plate that was on the 351M I think....
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