You need to get a good look at the casting number on the driver's side of the block. It will be behind the driver's side cylinder head down on the flange that the transmission bolts up to. I have used small hand mirrors before to get a good look.
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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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