Junkyard front D60 for a TJ?

I've searched here & pirate but found no clear answers (unless they were in latin). I'm looking to put a Dana 60 under the front end of my Jeep... BUT I can't find the elusive '78-'79 F-350 D60... so the runner up is the '85-'91.5 F-350 but this has a diff further to the drivers side... Is this going to be too much of an issue for spring pad mounting? Since I can't afford too many mods at once I'm gonna have to set up the front for the stock TJ suspension & then later going to cool overs & a long arm up front (4-link in the rear)