A swap to 3.55s and a 28" tall tire would drop the rpm by around 350. A 2.75 first gear swap with 3.55s out back would make it take off like a set of 3.90s - just food for thought.
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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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