i've heard of a few people running the 484 cam in 383s, but none with AC...if you're sticking with MP parts, the MP online catalog has a chart showing which items to choose to get your car into a time frame - idk how accurate it is, though. maybe look into a different, more modern cam grind - i think people keeping manifolds get a custom cam to make the most of it. being a 4 speed you won't have to worry about a converter (wish i was in that boat ), maybe look into a 3.55 rear. i'm sure there's someone that's done what you plan on doing that will chime in