Steering issues in my 68 4x4!

[Butch's 68]

Hi everyone! I'm new to the site and this forum and found you all through searches while trying to find a part and info and I'm sure you all can help me. I have rebuilt 4 70-72s in my life, all 2wd and about 4 yrs ago found an almost all original 68 4x4 so I snagged it. I have been restoring it slowly when the army said it was time to go and I couldn't take it w/me where I was going so I sold the truck to my dad who continues to restore it. He noticed while moving it arround that it turns tight to the right but needs a country mile to turn to the left. He replaced all the steering linkage and it still did this. He discovered the steering arm had been broken and welded back up and figures that's the issue. I'm not so sure but I have never dealt with 68s or the 4x4's. I know it's got the factory Dana 44 closed knuckle in it and I'm looking all over the junkyards to find a new steering arm...no luck yet. Does anyone know where I can locate a new steering arm or what years of new axels will work under it? As I'm starting to think it would be easier to find a new axle and upgrade to disk brakes vs. keeping the closed knuckle. Thanks and I love reading all the posts & questions...love learning more about these great old trucks!