Sounds like a lot of work to gain a 1/4" (or with a lot more effort a 1/2") more clearance between the tire sidewall and the leaf spring. Then add is the shorter life span of the narrower leaf spring and the other problems connected with the narrower springs, Up until sometime in the early 60s, all the Mopars came with 2" wide leaf springs, and Chrysler determined there were enough reasons to widen the leaf springs to warrant the expense of doing it across the entire line. Going backwards with engineering really doesn't make much sense to me.

Without looking into the costs, it may be cheaper to just move the current leaf springs to the inside of the frame and solve all the tire sidewall to leaf spring clearance issues completely. That effort has proven results.