Braking problems

I recently replaced the rear end in my dart with a 8 3/4 with all new brakes on rear. I found I had a bad master cylinder so I replaced that and the booster. I did not buy the pre assembled set up as I changed the master first then determined the booster was bad. I installed the reman booster, did not adjust the push rod as I figured that was probably set at the re-builder. Have new front calipers and pads also. I bench bled the master and have bled the lines several times and am not getting out any air. My pedal seems a bit low but I seem to have excessive pedal travel if I need to preform a quick stop and it seems to take quite a bit of effort. I know I can set the rears tighter to raise the pedal but I am wondering if I didn't screw up by not checking the push rod adjustment. I have done lots of brakes over the years and never had anything like this from just changing components.