Hi Monty;
The classic problem that may arise after a brake rebuild on our cars, is that the calipers are not installed correctly left/right. If this is the situation, you will never be able to get all the air out and the pedal will be soft. A variation of this problem is that when buying reconditioned calipers, the two halves may be mismatched.
Start by checking your calipers and make sure that there is a bleed nipple on top pointing inwards, and not one at the bottom pointing outwards. This is how it should look (front):

Erling.
--
My 240 Page
|