Score! I think you left out a # on that crank. I found limited info for a 3904815 crankshaft. It is listed as a crank for 396, 402, 366T, and 427T applications. It is cast, not forged. And listed for 70' - 75'. HTH
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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