Bulletin - Rear alignment procedure.Click
You will still have to try and dial out camber, but at least you will have had a proper alignment done.
Rear to Front - Caster, Camber, toe is the usual rundown of how to perform a 4 wheel alignment, as the front compensates for whatever is happening at the rear of the vehicle - ie Pull, dog tracking.
There is only so many adjustments that can be made at the rear of the early 90's independent rear suspension, and camber isn't going to be that large an adjustment one way or another, as the car is not meant to be "bagged" or "dumped" very low.
If you have an alignment sheet showing what your car sits at currently or visually, we can at least tell you our thoughts.
That being said, if the car is sitting in the weeds or on the bump stops, there is no helping the situation.