master cyl. for pwr.disc brakes

Hi Guys,

I have a 72' Duster with standard front drum brakes. I want to replace the drum brakes with front disc brakes from a 74' Dart with power brakes. Can I just leave the power assist unit off and use the master cylinder off of the 74' Dart as a standard brake master cylinder or is the power braking system required?

Thanks,
Chris