Try a governor kit from B&M to reprogram the shift points. But first try messing with the vacuum modulator. Remove the line, and back off the screw inside a half - to full turn. Then go drive it and see what it does. It might just need a simple adjustment.
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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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