I'm not sure if it is a duel master brake cylinder. The car is a base model so i would think not. I do know that the brakes are all manual, no power booster on the car. A friend of mine told me a while back that a ford granada rear axle and front end will bolt right up to the falcon. I tried to look for used parts online and called a couple salvage yards in my area asking about ford granada stuff. They all kind of were surprised to hear that because they told me the they havent seen one of those in years lol. With the mustang being similar and "more common" than the falcon, i was thinking it might be easier to search for mustang parts instead of falcon parts. I just dont know the differances in what will and will not work between the two? And insight will be helpful and apreciated as always. Thanks in advance

 

Doing an update to disc not necessary, but its what I'd do.
If you stay with the drums I would still update the master cylinder, add the brake
booster, (need to find a vacuum port) for that, But all that is up to you
and how much work your willing to do. and how comfortable you are with
working on cars.