Alignment shop says they can't get over 1 degree positive caster on 73 Scamp

We have been able to get about 2.5 degrees caster with about 1/2 degree neg camber. The trick is to start with the front cam all the way out and the rear all the in. Then adjust the rear cam out until you have your 1/2 degree of neg camber. That is the most positive caster you can get out of the parts on your car. This is all done AFTER the ride height is set.