Kelsey Hayes disc brakes

My KH originally came with power assist but the MC and booster went kapoot so I changed it over to manual brakes. I got a 1 1/32" bore MC for a 1980 Aspen or Diplomant or something and bought an adjustable pushrod and a 2-to-4 bolt MC conversion plate. It didn't stop too bad. I'd prefer a smaller bore MC though.