Master cylinder help

I'm sure this has probably been asked many times before,but I haven't been able to find a thread with a similar situation. I have a 72 Duster that came with power drum brakes. I have switched the fronts to disc and rear to 10 in. drum. What I need us a master for power disc/drum. Most of the stuff I see people doing is manual brakes. Could I use one from a 72 coronet? Any help would be appreciated. Thanks