383 power?

As far as cam selection goes, it depends on a few things starting with the cars weight, gear ratio, tire size, intended useage and what your willing to live with. Also, the stall converter will have to match up with the rest of the package.

What is the operating RPM of the engine/car? IE: driving around in the 2000 - 6000 RPM range.

So far we have steel heads, RPM intake and a Holley carb in a Duster? Right?

IMO, I would use a KB zero deck height piston. A flat top. This piston will work really well later on with closed chambered aluminum heads with a .039 gasket. This combo (Steel or aluminum headed) is pump gas freindly.