Master cylinder for manual disc brakes?

I'll put some thought into that, I plan to cruise with it so I don't want a hard pedal but I do want one that doesn't need a lot of travel just for confidence same. How does the factory replacement one compare to the truck one? I don't believe the one on my car is factory. It appeared the previous owner changed to a disc master and was about to swap to disc brakes but fell short and still had the drums from a /6 car around it but that's all changed over now (check my build thread for in depth details) . I'll look over the one I have and make for sure if it needs replaced while the engine is out so it will be easier.