There was a guy here who went ALL the way with it and turboed two drivetrains. Ended up running high 7s I think, in the quarter. In a race chassis and with stock bottom ends. It was in a GTP for awhile though. Wild.
My 69 had a 65 GTO tri-power on it when I got it. Wish I hadn't had to sell it. I could fix that, I can't do much fixin on a PCM, ha ha.