In one of my 68 GTOs the one with the 6 speed I sold Laz, I did 120 plus on 880. I was in 6th, and was about 3500 RPM and it was still pulling like mad, when I backed down, I had pegged the speedo for some time accelerating the whole time.
Car seemed fine but there was just slight to many cars out for me to push it anymore.
That car rocked. To bad I cracked the frame or I would still own it.