Welcome to FABO.
I am in the minority...build your Duster how you want it.
A-Bodies ain't worth a ton of money.
Your mods sound like bolts-ons...just keep your original parts to go back to stock or pass on to the next owner.
If you want to go crazy with body mod and custom touches...then maybe think about another car.
Where do you hang your hat in the Motor City?
I can't say that I have seen your Duster...seems like I would remember a beautiful car like yours.
Paul