According to what I found, it is a 1965 327. The "HF" suffix is for a Corvette, 300 HP, manual transmission. Sounds like you have a great platform to start with. I would totally build it as an L79 clone. (Aka - 350 HP 327)
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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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