9" rears dragging

72 Dart manual 9" drums ft and rr. I just replaced almost everything: master, lines, hoses, wheel cyls, shoes, hdw. After driving for a short distance the rears start to drag and get very hot. Next morning rear wheels turn freely. No binding of m/cyl pushrod. I suspect something with the new master. Parking brake cables are bad so struts are temporarily removed. Any ideas?