[mickmate]

The ride is too soft at the rear? That would just be a matter of getting the correct spring rate. I believe you want around 300-325 springs. Any idea what you have?
I am still making the retrofit watts linkage kit. If you have nothing to stop the forward/back movement that gives the rear end a workout. They had (mushy) rubber bushed radius rods in the Jag. We are typically running much higher horsepower and fatter tires on the rear end. The greatest advantage to the watts is positively locating the rear hub carriers with no front/rear movement and it does more than the suspension travel with no bind and no arcs to pound the swing arm bearing.