Just to update this... and to add to the confusion. I was able to look at a "survivor" car recently. It had a 3999265 fan instead of the common 772. The 73' dated 772 fan I found on eBay a while back is a real oddity. Possibly it was an over the counter replacement?
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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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