My car has essentially stock ride height in the front, all stock suspension and brakes (well, except for the 1" torsion bars and Comp Eng. Shocks), but I am capable of obtaining stock specs with the t-bars and the rear suspension is all stock. How close are the tires in the rear to the leaf springs at the stock location? I have super stocks out back, so ride height is not too much of an issue. I'm higher if anything, but the Swinger quarters cover the tire, unlike your duster.
