It ended up being an HR coded LM1 350, but I bought it anyway because the price was right. Going to try to barter with the owner of my original engine. If I can't make a trade, I'll have to locate a set of cylinder heads to make this one what I want.
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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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