That casting # block corresponds to 1973-85. The 781 & 049 casting heads are what many people like to use.
As for any good, what are your intentions?
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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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