I don't take those guides for the gospel. I've personally seen a few small block 72' cars with the ZL2 cowl induction and a build sheet. Back when these cars were new, you were able to order virtually anything you wanted - unlike nowadays.
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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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