brake pedal too high

Ive noticed the same problem also. I have converted a 69 swinger from power disc to manual and a 68 valiant from power drum to manual. I purchased two used pushrods from manual cars and noticed the pedal is way up off the floor. I tried the adjustable pushrod from mancini on the 69 swinger and you cant make it short enough to solve the problem. I reused the same master cylinders on both cars, and i dont think that is the problem. Someone stated in an earlier post that the pedal may be different, and that makes the most sense. if some one has some info on pedals, that may help solve this problem.