383 cam advice?

Of the Hughes and Howards cams you posted I would go with the Hughes for a heavy car with 3.23 gears and hp manifolds.

The hotrod article is a good example of your cam choices.That engine would have faired better with 1 3/4 headers IMO as well.

I have actually started considering headers instead of the HP manifolds. I just remembered I have a nice used pair. Think they are 1 3/4"