I'd run a performer RPM, maybe with the divider ground down and a 2" spacer and if you're looking to stick with flat HYD, maybe go with a hughes HEH3742BL or HEH4246 (237/242 @ .050, .584/.592 lift w/ 1.6 rockers, 108 LSA or the later which is 242/246 @ .050, .592/.606, 108lsa)...that should hopefully keep cylinder pressures down so that you'd be happy with pump gas and still make PLENTY of power.
The amount of low/mid range torque w/ either cam would be stupefying though.
Nor would I be adverse to doing a basic 383...with a good "268" cam and tri-y headers with good AL heads it'd be a nice street combo that would certainly be enjoyable at a cruise night and smile inducing at a stoplight drag