Duster suspension set up questions

I think he meant more that you have a lot of knowledge on the suspension of the A body as notice on most suspension comments you have a lot to offer.
My rear wheels are a 8.5inch wide with 3.5inch back space. Took a gamble on them as they were super cheap with bead locks and new rubber
That gives me lot of hope with the rear and guessing the calvert 9 way adjustable will be suffice

I applaud your optimism! But don’t share it, unfortunately.

You’d need more backspace than that with a stock width rear axle, but you’re shortening it right?

Another option in the front is the 2” drop spindles that are available. They add bump steer, but, would allow you to keep your lighter torsion bars which would be better for the strip.

I didn’t want to compromise on the bump steer because I was building a handling ride and needed the larger torsion bars anyway. But if your focus is more strip than street, the 2” drop spindles are probably a better compromise for you. I’ve run them on an E-body, the bump steer is enough to notice when driving it hard on rougher roads. But it’s not enough to be dangerous IMO, and with easier driving it isn’t really noticeable.