This old Indy headed combo (422) ran 5.98 which is exactly the same as my Edelbrock headed 408. But the 408 has a .650 lift roller cam and the 422 has a .650 lift roller cam. I know I can get more out of my Indy heads but the set of Edelbrock heads I’m doing now are better than the ones on the car. Lol. So I may do more work on the Indy heads and intake and grind my R3 so I can move into a roller cam. Hmmmm lots to think about.