shackle reversal

So this process started with an 89' carbed yj that I recently purchased. I knew the carb needed a rebuild but I decided to buy a mc 2100 and just replace it instead. Here is where the issues started. I started looking around to see how complicated the install would be and discovered about a half...

I want to do both these to my '79 CJ7. The shackle reversal for a smoother ride on the road & to reduce risk of frame cracking. The YJ springs to get the (again) smoother ride the wider springs of YJ reportly give. Any aftermarker approaches to do both of these that anyone has tried ? I want to...