help with suspension set up

The KYB's are a day and night improvement over a typical parts house OEM type replacement shock. They tend to be valved a little on the stiff side, (some would say harsh) but if you are running stock .870 torsion bars the aggressive shock will probably be helpful. My 72 had a factory sway bar, .870 T-bars and 6-leaf rear springs (from a wrecked 340 car) with polygraphite bushings and KYB's all around. This way my daily driver for years and it was a thoroughly pleasant car which handled quite nicely. No, it wasn't a 911 or Vette but it didn't need to be.

If you can swing the cost, Bilstein shocks would be even better still. I've used KYB and Bilstein on other non-Mopar cars and while more than twice as expensive, the Bilstein is more than twice as good.

If you plan to use the Factory front sway bar, then I'd suggest the smallest rear bar you can find. Try driving it before you buy the rear bar and then decide how bad you really need it. I would spend the money on new HD rear springs with poly bushings (front eye especially) before a rear sway bar.

Depending on what the front end weighs, you can go bigger on the front T-bars without hurting ride quality. If you have power steering, A/C and an iron manifolds .920's wouldn't be overkill.