You could use newer Jeep axles, driver's side pumpkin. I think the F150 or Bronco (78 & 79) Dana 44 would be a better bet. Second, the Wagoneer (83+) uses a DS pumpkin and 6-lugs.
Narrowing is optional, unless you really want to. Baldy runs the F150 front axle on a D50, uses 35" muds, but is for dedicated trail rig. I think the Wagoneer axle is a pretty good match without mods.