You ever get your axles figured out? Since you have a ton of 1st gen stuff, why not just build them up? Straight axles from '84 would be best, as they have the support brackets welded in from the factory, and I would not worry about snapping axles at all if you run Longfield's Superaxles. You will not break them, and if you somehow did, Bobby has a lifetime warranty on them, free replacement if you do! Chances are, you'll break the diff or transfer case before you ever hurt those axles.
And that's some nasty scaling on that frame! I gotta see how it looks once you sandblast it. Hopefully it doesn't blow through when you clean it up.