The engine was a little tired, as was the transmission (THM 400). But it did OK. It did the quarter mile in < 16 s, ~ 95? mph. It would have been much quicker with decent tires (it would lose traction very easily in 1st and 2nd) - maybe in the 14s range. I'm sure it could have done better with a little work. 6 people in the car cut the top-end some too...
A friend had a 68 GTO that he massaged a little. That car was scary-fast. He ended up bending some pushrods racing some monster dual-quad tunnel ram thing (and getting stomped in the process). He fixed it and sold it shortly thereafter. Big mistake. :-(
Manual transmissions help a lot. Especially overdrive. ;-)
Cheers,
Scott.