I would start by replacing the radius arm bushings with OEM rubber bushings. If you choose to use caster correction bushings then the OME ones are fine. Personally I would use caster plates rather than bushings. That will set proper caster and keep the factory rubber bushings in the arms...
Sounds to me like worn out suspension bushings, worn out and loose steering, possible frame cracks. I'm sure it could be sorted out fairly easily. Do you know what lift is on it?