Is it 4x4 or 4x2? If 2WD then to an extent yes you can go by the skosh chart. By 1985 the factory specs should be pretty close to that anyway. 4x4 will have front leaf springs which don't offer the same adjustability.
My '72 D200 is 2WD and the current alignment is very "neutral"; little to no caster, camber or toe. I want to turn up the caster a couple degrees so the steering has a little more feel and is more self-centering.