Call Mike at 4x4land and see what he says about the body work.
As for the stroker find a blown 258 and steel the crank. I paid about 3k for my stroker but I didn't feel comfy assembling it myself so I had Straighline performance in Independence do the work. Awesome to work with and very reasonable priced. If you have the tools to do the engine build yourself then you can almost cut that into half or less.
Mine has forged pistons ($600 for the set) and lunati voodoo cam (cheaper than comp cams and no worn lobe issues) and a few other parts that pushed my build price up. The machine shop decked the block and a 5 angle valve job on a 96ish head on an 89 block. Find some 24lb injectors Mustang injectors on Ebay. Check out www.jeepstrokers.com
for good info on strokers.