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Have you considered something like this Street Lynx system A Body Joe just installed?

https://board.moparts.org/ubbthreads/show...part=1&vc=1



This is a very nice set up. while the coil over change allows a greater range of spring rates and the link arrangment is somewhat lighter than leaf springs, it doesn't have any adjustment in it for roll center alterations. Not that this is a big deal for most guys as once it is set, they learn to live with it and they never run it in varying track conditions that require tunability. However, with a few simpler mods than this system requires, leaf springs can be set up to have changeable roll centers which can then be used to alter the amount of rear bite you need in your set up.



A big advantage to coil springs over leaf springs is that your roll rate is 30 to 50% lower with coil springs than leaf springs for the same wheel rate. The result of the higher roll rate is that you have to optimize your leaf spring rate for roll rather than for ride. You can increase your rear roll rate from the 30%, but you can not decrease it to a coil spring level with conventional bushings. Stiffer spring bushings such as poly or nylon will increase the roll stiffness of leaf springs as will angling the rear springs. I wish the Street Lynx kit were a five link rather than a four. Even the GM suspension designers, who used four links for many years now admit they are flawed.