383 Build up questions...

A true 9.2-1 ratio with Engle cam K-54 .470 lift 260*adv duration w/214*@.050 112cl, then get 750 vac secondary holley and an rpm dual plane manifold and some hp exhaust manifolds or headers.

Multi angle valve jog on the heads and stay with 2.08/1.74 or 1.81 exh
You don't really have to head work but can have them mildly ported.

3.23-'3.91' gear will work with this cam and stock stall convertor to 2500rpm stall convertor being optimum.jmo