Be sure of the transmission mount. Some of these replacement mounts aren't 100% correct and can affect driveline angle just enough to throw things off. However, the driveshaft was my first thought when reading this. Then I wondered to myself weather or not you had a polyurethane transmission mount.
HTH
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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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