As other have said before, H as the 5th character of the VIN = 350 2bbl. Believe what you want, but people do forge phony build sheets, trim tags, etc for these cars. My ex's father bought a supposed 70' LS6 convertible, everything seemed to check out. He continued to look the car over after taking delivery. Eventually figured out someone had done a great clone from a 307 Malibu. Luckily he caught it pretty quick and was able to solve the issue with legal action.
Buyer beware this day and age...
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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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