74 duster lca bolts/studs?? replace?

I went and bought a new lower ball joint to put on my 74 duster. Problem is when I went to loosen nut ??15/16"?? it wont come off. Damn thing had either the nut or the stud threads stripped. Are these studs easily replaceable? Maybe I got lucky and its just the nut? Any ideas on how to get the nut off without ruining anything else? If its the stud then I can probably get 2 big washers about 1/8" thick to keep new nut on threads. Needs alignment after anyway because I'm also replacing uca bushings. If its the nut then I can go to Fastenal and hopefully get a new one.

My thing is- I want to be covered either way before I start to take it all apart. I don't like leaving jobs undone over time. I don't really want to use washers because that will throw the geometry of every thing out of whack for the alignment-ie camber issues.

Mind is fried and hoping its just the nut that's screwed up, much like myself- the nut is screwed up=as my fiancé says lol. Its almost 4 am-cut me a break lol.