MASTER CYLINDER

OK, I'm at my wits end. Changed the master cylinder, Wilwood says 1" bore is perfect. Threw out the line lock! Threw out the distribution block, assured everything is plumbed correctly! Still, no pedal!!!! No leaks. Wilwood proportioning valve set dead in the middle. Bleed em out, no air.
I was told, pull the calipers and push the pistons all the way back in. Anyone have any idea why I cant get these to bleed out properly?? And yes, I bench bled the master.
1966 Dodge dart convertible. 318, 904, master cylinder is out of a 1978 Dodge Aspen. Re manufactured master from Cardone. Best brakes 10-1628.
HELP!!!!!!!