master cylinder part #

[one bad demon]

need some help trying to figure out what master cylinder to use.i just picked up a 71 demon with a 440 4 speed i am redoing the brakes.come to find out it has a front disc set up from a 73 74 a body rear brakes are 10 by 1 3/4 im thinking it should be 9 " rear brakes by the vin this demon started out as a 318 3 speed trans. this is a manual brake car

 

[subcom]

Probably a MS from a 73-74 front disc car. Try Rockauto and see what they list for a 73 duster or dart with factory front disc, rear drums. You may need a proportioning valve as well. Check out inline tube for prop valve/distribution block if you don't have one installed already.
http://inlinetube.com/Prop Valves/pro_valves.htm

best of luck