With the bigger heads and intake, on a stock stroke combo.......I’d think you want something that flashed 56-5800, and then was pretty efficient from there on up.
I don’t think you’ll get that out of a 9” behind that motor.

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