Bee Bob,
My combo: 493, RPM heads (cleaned up pockets, back-cut intake valves), Hughes flat tappet cam and kit (HTL6064BS), 10.5:1 CR, Doug's 2" headers with 3" X-pipe system, Flowmaster Delta 44s, Dynamic converter, and 4:30 gears.
Intake is factory aluminum and carbs are set up per Chrysler's recommendations: Engine Manual specs for Super Stock.
I wound up with .136" holes in center throttle plates and .086" in both secondary throttle plates, Secondary idle screws at 1 1/4 turns out and went from #80 mains in outboard carbs to #90s to achieve a 30 HP gain at rear tires at Steve Morris's chassis dyno. 35 degrees total advance.
Oddly enough another 20 HP appeared when I opened my exhaust cutouts. I guess those Delta 44s are rather restrictive!
Before the dyno tune the best test & tune time was 11.64 @ 114 through the mufflers and air cleaner. Hope this helps you out! Mike