EBC Pads on Kelsy Hayes Brakes

I was running NOS front disc pads on my car. When they got hot they lost a lot of stopping power. The pads had maybe 5,000 miles on them or so. The rotors and calipers were replaced back in the late '80s and still in excellent shape. I bleed the brakes every couple years to keep the calipers healthy. That is a must for the 4 piston calipers.

My set up is as follows:

Factory manual disc brake car.
15/16" Master Cylinder (order for '73 Duster 340 with power brakes).
7/8" rear wheel cylinder (order for '72 D100 2WD rear).
All new brake lines.
New rear drums, new rear shoes, and all new rear brake hardware.
Goodrich braided brake hose kit (front and rear).
Mopar Performance adjustable proportioning valve.

Here is what I started with: