Exhaust Suggestions / Assistance

Need to hear what you think I should do with my '75 Dart Sport Coupe RestoMod. (Daily Driver)

318 Setup:
Comp Cams K20-220-3 Kit (110 Deg Lobe Separation, .432 Intake Lift and .444 Exhaust Lift)
Edelbrock Performer Intake Manifold
Edelbrock 1404 500 CFM Carburetor
Rear End is a Ford Explorer 8.8" Diff (Disc Brakes ;) ) with 4.1 Gears
Headers are Hooker 5901 HKR Full Length 3 Inch.


I need to design the rest of my Exhaust:

1) Maintain 3" all the way back or reduce (at what point) to 2.5" ??
2) H Piece or X Piece or none?
3) Resonators / Mufflers? (I want a low noise ride, that Roars.... discreetly)
4) Straight out the Back Tail Pipes or should I Dump after Mufflers? or Side Pipespast rear Tires?

Many Thanks in advance.