Using the fender tire as a bump stop you could get the tire bound up and snap an axle.. do axle to frame bump stops, as wide on the axle as you can, or trim more.
We have guys on toyota axles (alloys) wheelin hard on 42s..a stock d60 with neckdown shafts isnt much stronger then a non neck down d44 shaft.. at least get some new U-joints.
I have a 86 xj 350/700r4, 32's, long arm. It was way more work than i expected i would not do it to a daily driver again. Made a long arm kit to clear headers and motor n stuff. Also had to move out upper control arm mounts on axle torward spring as far as they could go to clear oil pan. The stock 2.5 radiatior is cooling great, Runs 160 on highway.
ive searched a bunch but i havent found anywhere. what headers are you guys using to swap in a sbc? ive got an 86 xj with a 2.8 and im going to be swapping in a tbi 350.