Eric, I think you'll want to invest in a set of stiff sidewall slicks with the six speed. A friend of mine was struggling in 275X with his T56 equipped car made the change this year. (Now he's in a different class.) His car is once again consistent, and close to the performance of when it was automatic.
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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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