I’d put it back together with the Bullet cam.

I built a RB451 several years ago.......
13:1, SR heads with MW openings that flowed in the 340’s, port matched 440-3, 272@.050/.650 lift cam, 1.5 rockers.
Made peak tq at 5500, peak hp at 7200.


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