272/272 is pretty big for 10.5cr, 3500 stall, and 3.73 gears...... Especially when topped by a 400-2.

The 264/270-112 isn't ideal either IMO.

If its really only 3500 flash stall, I'd expect something about 10deg smaller on a 108-110 would be quicker in the car.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads