Leaf spring question

[jaybee]

OK, I've spent some hours going through posts and searching topics. I've picked up that a leaf spring suspension can be tuned to work well on the street with the right spring rate, shocks, and MAYBE a mild sway bar to fine tune the balance. Sounds also like adding a panhard or watts link is wasted effort for a street car (please feel free to correct me if I have any of this wrong). Also that there's a certain amount of disagreement over using Delalum or Polygraphite bushings

I'm also getting the impression that traction bars such as CalTracs or slapper bars at best have no impact on handling and at worst could be pretty detrimental, depending largely on preload. How about simple underride or override traction bars such as on early Shelby Mustangs?