I've done the nodular 428 crank in a 400 block. You need to have a good crank grinder. Had to weld the thrust area and re-machine. This engine still runs after 20 years and runs fantastic.
I did this when aftermarket cranks ready to go weren't readily available. Today I wouldn't bother with the procedure with all the 3" main cranks available, I'd just buy the crank.
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