So what would be the optimum RPM to be running at on a 383/727 at say 70 mph....staying in the torque enough to pass with ease and a little get up and go but not kill the gas? I'm trying to determine the correct gearing/tire size for what I want. If I know what RPM to be at then I can figure out the rest. I'm looking at multiple scenarios, gears and wheels compared to my desired driving habits. No OD hurts on these 727s, but I cannot see spending the money on adding it via aftermarket.