My 68 was doing it as well, ended up installing the StreetGrip kit (for nova) which came with dual rate new front springs (don't remember rate), 170lb rear composite springs and fox shocks. Lowered it 1+ inches but it doesn't bottom out anymore. Not sure if it was the springs or shocks that fixed it.
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1966 Lemans convertible 455/5spd
1968 Firebird convertible 400/4spd
Need more Pontiacs!
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