Brake pedal travel is to high/play

1973 Duster father son project, had 4 wheel drum with no power. Converted to front wheel disc with power. The problem is that the pedal travels up way to high and when depressed it travels down quite a ways before the normal braking area. The brakes work great and contact pressure where it should. Is there a difference between power and non power brake pedals? I am looking at modifying the stop braket and light switch to stop the pedal from coming up so high but I would rather get the correct parts if that is the problem. Its my sons first car we have been working on for 3 years and I want it right before he drives it. He gets his license in a few months and running out of time. Not to mention money!
Thanks
Reviver