Maybe the guy wanted disc brakes on the rear ?
I would think that a 318 Duster would have an 8.75, but I could be wrong on that.
I'd be remiss if I didn't complain about the boy-racer (or is that boy-ricer ?) wing
That and the black hood - another mod that just looks odd to me - hurt the car, but obviously some folks like that stuff.
Seems like a pretty clean car, given the few photos posted.