K-H brake swap done, but doesnt stop!

Its a 1972 dart swinger, originally a 318 car,now a 440. It had manul 10" drums all the way around. I bought a newly rebuilt Kelsey hays setup years ago and finally got it installed. I replaced the old drum distribution block with a 1974 dart disc/drum proportioning valve, like doctor diff sells for disk swaps..The disk setup has rebuilt calipers and new pads and rotors..They have been sitting in my house and then my shop for the past 15 years since i bought them..They bled just fine and the pedal is very high and very firm! I have to put all of my 210 pound rear into the pedal to even get it to slow down..