Got 3 questions here: Looking to replace the 40 yr old leaf springs on a 318 e body. I see summit has a good price on lowering leaf springs (95 each) or even the heavy duty set (105 each). Anyone have used the lowering set and do they recommend them instead of the standard (or heavy duty)? If you recommend to not use the lowering set, would it be better to go with the heavy duty set of standard set? Third question, I see they have the prothane shackle kit at a good price as well, any good or bad here?

Thanks,
Mark