If you're going to hard-core it, you will want to box the front frame horns on at least 3 sides from the front back to about the first body mount past the fenders. This is a weak aspect to the CJ frame, even the 81-86 CJ's. I've seen them crack in two around the shock mount location. Do it now, as it becomes less convenient later. I've plated mine up by degrees adding 1-2' of boiler plate as needed. What I need to do is cut all that patchwork off and start over and do one-piece plates. My son did a cardboard template of his frame horns (ea about 5' long) and had a bud with a CNC machine cut the plates with holes and slots cut in. Cool. No worries now. His frame broke IN Half on the Hammers with 36's.
Yes, the YJ frame is somewhat stronger than the CJ frame, especially toward the front.
Another thing to consider is the mongo twisting you get at the frame by doing a shackle reversal. Those anchors at the front have a lot more leverage on the frame than regular front shackles. This is the reason I have not gone to shackle reversal.
regards, as always, jefe