^^Boil this down a bit^^
Pedal should be rock hard. If not you have air in the system, or a problem with shoe fit (arc) in the rear
Pedal height......adjust up the rears a bit and try again. if the rears are adjusted, the brakes bled, then you need a larger bore master
I realize this is "different" but my 67 used a Linc Versaille 9" rear with factory disc, and 73/ 74 Duster front disk, and the factory drum master. Used up not quite 1/2 the travel, and rock hard.
