68 swb bleeding new brake problem

[panhead59]

I searched the tread about brakes and learned that i have my new disc brake calipers on the wrong side. I didn't realize they would bolt up "wrong". My bleeders are facing down. . Don't know if it's related but I cannot get fluid to the rear, stock, drum brakes. I just installed the CPP power booster with MC, new rod,the whole kit. I have fluid to the front, even though they are on backwards, and they bleed good. But no fluid to the back. Any suggestions on where to go from here. After I flip the front calipers of course|!!|!||!