Basically it is what others have said, by changing the front clip (fenders, hood, grille , valance & bumber) and the rear tailight panel, taillights and bumper you can clone any duster or dart sport into being a demon.
the roof, doors, quarter panels and trunk are identical on all of the 1970 -1976 duster, demon and dart sport models
I was consdering this for class racing since I have 1971 engine in a 1973 car.
Bob