that's a bit higher than stock, so maybe you'll be okay with a 484 cam. i'm going to use the Comp XE 268 in the 440 for my '71 (also manual brakes, PS). it's a .477/.480 lift cam good to 5800 RPMs. i would think that cam, or maybe one step above it would work pretty well in a 383 4 speed ( i have an auto, so without changing converters, i'm just about limited to the 268). i was really hoping someone with a 383 would chime in....