My 65 has 4 wheel disc brakes. It has Granada front and Versailles rear. Is the best setup for the proportioning valve to just hard connect the front lines to the master cylinder and use an adjustable proportioning valve on the rear. Somone on here a while back suggested one like this.
Ford Racing M-2328-C - Ford Racing Brake Proportioning Valves - summitracing.com
Ford Racing M-2328-C - Ford Racing Brake Proportioning Valves - summitracing.com