xj would be the easiest.
you can do any of these 44's in the rear with various required changes:
SJ centered 44 (waggy)
SJ model 20 (waggy)
passport or rodeo (plus cause it should have discs)
If you plan on having any type of real power I would scrap the dana 30. it is not stronger than a stock 44 especially the 3 pcs. garbage they put in the YJ. I went through 3 30's for bent housings at the shift motor. twisted knuckles and a slew of snapped shafts. I will tell you from experience that a d30 with 35's and 350sbc will not last long.
"We'll get out of this disaster in time for the next one"
"I'm done recomboobulating the energy-mo-tron"
88 YJ, 350/350 Chevy, Twin Stick Dana 300 with JB 32 spline rear output, 6.5" lift, Front Scout II Dana 44 w/Yukon 4340 shafts, trac loc, 4.27's, Warn Premium Hubs, flipped YJ Tie Rod, Ford F150 front calipers, Rear Scout II Dana 44 w/Alloy 4340 shafts, HD RPT retainer plates, 4.27's True trac, Steeltech Disc brakes, Cage upgrade, B&M Prostick Shifter, Custom Fabbed tire, gas, jack carrier, 3/8 angle rear bumper, clevis's all around, old & reliable rep8000 winch. Flood lights. loud stereo. 35x12.50 swampers and a bunch of other stuff