Your arithmetic is good. That amount of torque is not unusual for a well built Big Block Ford with displacement over 550 c.i, a good set of heads (like well ported C-460s), correct combo of other bits, etc.

The operating range on the track is just under 5k to just over 7k rpm. The tach. has a graduated scale 0-5k is in the first quadrant, then the 6k, 7k, 8k, 9k; 7k is at 1 o'clock.

The G-force box is an evolution of the Doug Nash five speed. We have made some further modifications to enhance longevity. Fifth is 1:1. In 2007 we used a 4.10 ring and pinion at Laguna Seca and Infineon and 3.70 at Thunderhill. Rear tire diameter is 28.5".