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Look at the parting lines on the crank. Narrow, peak shaped, (sharp) = cast. Looks just like the molding lines in any cast plastic item. If the lines wide, and has a ground off appearance, it's forged.

My nephews done some fooling with 460's and as noted above, the compression on all but the early engines stinks. FWIW, a set of the early "big plug" heads bumps the compression up a bunch on the later model blocks, and really changes their personality. I have an old Hot Rod mag from '72 I...