need brake suggestion

1973 dart swinger, sb...a/t... planning on removing the power bakes, and going with a manual brake master cylinder, has factory discs up front, and 10" drum in rear, axle form a for with the same sized 7/8" wheel cylinders as the mopar.. I did add a line lock in system. whit master size would be best for daily street use?
1.125....+/-.... or 15/16" bore... don't want a rock hard pedal, but want it to stop comfortably..... and lock up when wanted.... suggestions?