The hardest part so far is the unknown weight of the car.
Rear springs could be S/S springs or CalTracks. He doesn’t need to rub the rear in order to run a 10.99 or less. 10.0’s are a different story. If that’s what your thinking.
He said stockish leaf spring suspension with stock wheelwhells. Figured stock or super stock springs
On a Duster( with correct backspace) 10 inch 88 circumference tire is your limit.
That said, those two above limiters are more than capable of running anywhere in the 10’s plenty have done it, including me.
Dusters have great rear overhang and make great racecars. Doesnt take much to get them to work at all