went to the parts yard

Your original valve will work but the disc brake valve might work better. Look at them and if it looks different than yours get it. The disc brake valve has a couple extra valves in it that are supposed to make it work better but I've read where other guys used their original valve with no problem.

Several of us here on the board have had problems with remaufactured master cylinders. Look back about a year ago in the brake section and there are several posts there about the problems. I'd get a new one if I were you. I got a new one for my Cuda from Napa for $45. The reman was $30 and I got 3 junk ones in a row. Problem is they can only be rebuilt so many times but these reman companies don't care. One I got could not possiblly have been tested like they said it was. The threads in one of the output ports were mashed all up. There's no way a line would have screwed into it.