70 Duster power to manual brake conversion

Is the brake pedal properly parked against it's stop, and not hanging up on the brake switch?
I know the manual brake pedal looks different from a power brake car. I wonder if the pedal-ratio is the same? And if the top pivot is in the same geographical place?
I have done this conversion a couple of times and had no problems.
BTW
In the manual M/C, the brake rod presses into the back of the piston, and there might even be a small retaining clip (not sure, it's been a long while).It really has to be jammed in there. Then you install the M/C with the rod, and finally hook it to the pedal. This is different from the M/C for a booster. Perhaps your pushrod is just not fully seated.