HELP disc brake swapping

It will not make a difference whether the calipers are in front, or behind the spindle. I've done them both ways. The only REASON to have them to the rear is front swaybar clearance on the pre-73 swaybars. Its important that both bleeder screws are to the top of the piston chamber for proper bleeding.

If you have 1 caliper to the back, one forward. It probably because you have the same caliper part number on both sides. If that's true, you have to stagger them to get the bleeders to the top.

The 4deg. out is not related to the caliper piston. the alignmnet guy is guessing wrong here. Something else is out of wack. My guess, LCA/strut is not seated properly, somehow.