SMOOTHER RIDE?

I finally after 15 years have the dart road worthy. I have put about 50 miles on it this month, the main problem is the ride. It is like riding in a train car going down the tracks. I have installed all new ball joints, tie-rod ends, idler am, and pitman arm all stock replacements.
The shocks are older but seem to be in good condition, the torsion bars are slant six bars ( I am running a 360 now). The rear springs are replacement 6 leafs What can I do to make the driving experience more enjoyable?