I have a stock 1966 383 with just under 250k on it, a stock 7727, and 2.76 gears. I'm running a 225/75r15 tire. Its been a little while since I've done this but you can stay in 1st till 65 and 2nd till 115 before valves start making bad noises. If I remember correctly that's around 6,500rpm.
Is...