Bars and springs match?

Here's my experience so far, 67 dart, replaced just the rear suspension from old leafs and KYB's to oval track 120 leaf springs and single adjustable hotchkis, very very noticeable difference the whole rear of the car felt more solid and predictable. I don't know which improved it more the leaf springs or the shocks but I'm more inclined to say the shocks, I think you would be happier saving up for the RCD bilsteins, IMO.