Help "tune" my supercharged 360 1972 Dart, please!!

My buddy never drove a "muscle car" before so we went for a ride and I let him drive it back to the shop.
While out we went to the local certified scale and weighed it.
The car is 3,240 lbs. The fuel gauge doesn't work so I wasn't sure how much was in there but it should have been around 1/2 tank.
Obviously that's with the supercharger and the car is fully dressed (full interior even though most of it is in pieces and is lying in the rear seat & all options still functioning). This car is also lugging around some extra weight from using power steering, power disk front brakes (with stock cast iron master cylinder), steel wheels, factory large/heavy starter, and such...