I ran a 508 mopar stick for years that cam is a race grind and should be matched with a 4 speed and no power brakes ...I ran it on the street and think it had about 11 lbs vacuum
Manual brakes on my car, and 3.91 gears. I have a three speed. I'd love to have more gears but the 4 speed would be a big swap. Did you run vacuum advance or all mechanical?