On the SS/springs there are 2 rear lenths 35"and 36", you can set up to run bouth by having 2 rear mounting points. I am running a 1/2 leaf on top of the spring pack from the front spring eye to the back of the spring perch and all the leafs are clamped at the front of each section. I allso run a shock from a 94 Dakota 4x4 pickup. I allso run aluminum bushing in the front spring eye. if you have a mopar chassis book lots of info in there not just in the spring section page 215 in my old book mid season chassis tune up.
Have fun go fast
PM me with any questions I will help if I can.