Okay, first off, just so that you know, the 351C, 351M, and 400 are all Cleveland engines. The M in 351M stands for Modified, because they took a Cleveland 400 block, and modified it with a 351W crank, and came up with another 351 engine. They did this because demand was too high for that size engine after they stopped production on the 351C.
You need to find a flywheel for a 400 engine. You can't use the one from the 300.
Take care,
~Chris
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