Did a front drum to disc conversion on a 66 Coronet convertible. Manual not power brakes. Bought kit from Right Stuff. Ran newlines and installed the kit. When bleeding the brakes, and all air removed, the front brakes are locked with no pressure on the pedal. Adjusted the new actuator rod from loose to firm, no difference. Bought new hoses, no difference. Bought new master cylinder, calipers no change. These replaced the new parts from the kit. The only way to unlock is to bleed pressure form the system. Front and rear systems are independent. The proportioning valve is for rear brakes only(still drums in rear). Right stuff is stumped as are all my car friends. The Right stuff kit uses parts from a 73-74 mopar A body according to Right Stuff. Does the system require a Mopar Combination Valve or other device?