I currently have the original 3 leaf springs on, rear sway bar, and urithane bushings. We also have a pair of old gas shocks on, that we installed by a friend that he had laying around. The car has a 351W, and 3.55 Rear end wit FMX tranny, and its a daily driven car. We want to upgrade the rear end, and seeing if anyone had any input or experience with a 4 or 4 1/4 leaf springs and a shackle kit. And if QA1 gas shocks or Koni shocks would be bettter? Let me no if you have any other good options.