If you look at a "normal" car that use shims to adjust the upper control arm you can begin to understand how the offset bushings can be installed to do the same thing as adding or subtracting shims. The bad part is you have to know what you want to do when you press the bushings in. The good thing is you can still adjust the lower control arm cams to fine tune the alignment. By using different positions you can move the upper control arm in or out to help with camber issues or you can install them in opposite direction to gain more positive caster. There are many combinations that you can do, but again that's why it is important to know what you want to accomplish in terms of alignment settings before you install them. Then you can figure out what position will help get you close to your goal and then do the final alignment with the lower cams. If I remember correctly there is about a 1/2" swing from one extreme to another. Basically speaking, you can use the offset bushings to move the balljoint in or out, or front to rear depending upon how you rotate them before pressing them in.
Clyde.........75 Monza 2+2