Thinkin about making some changes to my Duster

Hi guys, I am really struggling with making some changes to my Duster and I know that I am not the only one going through this so let me know what you think. So here is the dilemma, customize my Duster or pick up a Dart or Barracuda and customize that.

A little history - I have had the car for 20+ years and have restored it to what you see here. It is an original 340 4speed car and I have the original engine although it is not in it, it has a warmed over 340 in it.

When I redid the car I fancied myself a drag racer so it has 4:10 gears, SS springs, 90/10s up front and not a lick of insulation. It looks very stock and runs low 12s. I want to build more of a street car that handles so I would like to ditch the factory suspension for something from RMS or HemiDenny. I want to add air, a custom dash, cool wheels... My struggle is the car is so damn nice the way it is.

Thoughts? Buy something else or start ripping the Duster apart?