I took a closer look at your pictures now that I'm on my desktop. That twisted up power steering hose

Yes, that is a strange way to do a saginaw box mount, however for a short term fix short of cutting the entire frame horn off and redoing it with the typical 4-bolt box (or a FJ60/FJ80 box up towards the shock mount which is what I typically do in my shop) it looks like simply putting high-steer (or "medium" high steer, flat steering arms) on it would correct your drag link angle and you should have adequate clearance for that with how much lift you have, even SUA. However that drag link angle is really only going to contribute to bump-steer.
The wandering you are feeling is because there is probably zero or negative caster. This can be easily corrected with shims between the axle and spring or a shorter shackle if you'd like to lower the lift height a bit. IT looks like you have pretty long shackles.