budget street motor 360 or 383 for 71 duster

sell the edelbrock carb. Buy a used holley 650/750 double pumper, set of headers (Doug’s d453’s or cheap summits (may have to loosen control arms and jack up the torsion bars so they don’t hit the ground after ever bump), alignment.
Buy a new set of plugs (wires if needed) and find someone like AJ to tune it. Start with the timing than the carb.

Once you get it tuned buy another set of plugs slightly colder and pull a couple degrees of timing.

Buy a nitrous kit. Install it.

Race your buddy

Sell nitrous kit.

Enjoy your sweet ride.