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.
Friend had kind of same problem,We were really scratching our heads. The problem ended up being the front calipers were on wrong causing the bleed screw not to be up at the very top witch caused us from not getting all the air out of the caliper. They can be installed wrong front to back of rotor.If I remember correctly the caliper should be mounted back of rotor not in front if this makes since. Good luck