Switch to manual brakes makes car run better?

I’m gonna be going from power drums to manual disc in my 68 Dart.. the booster just takes up so much room around the engine are.. I figure manual disc is still a great upgrade and have more room for activities
I have a 70 Swinger and have been thinking the same thing, have you come across a thread outlining the conversion/parts involved? I have power drums/front disc. I guess with all the talk about master cylinders, bore size, lack of master cylinders, etc, Im just wondering what MC we should use.