I will stay with the 360/4 speed in my 66 B-cuda. Using Moparts charts, they call for a 26" tire on 2800lbs, to reach 117mph @ a 12.1 et @5800 rpms. That calls for about 330 t0 350 rear wheel hp. If what I hear is true, you lose about 25% (on the dyno) from the clutch to the rear, so I'd need...