Advice on 383..

you could use more initial timing, 20 deg or more, find what your engine likes, then you will need to limit your total mech. you could use a taller tire 29 inch and at least a 4.30 gear.
your mph is a 12.90 with a good tire and suspension.
your combo has low 12's in it, just needs some tweaking.
the cam and heads can come later, to dip in the 11's.