Power Brake Hell..... HELP!!!
The pedal height issue would probably be in the booster linkage or in the master pushrod length.
Spongy pedal is 99% of the time air in the lines. as noted in a previous post master cylinder bore diameter will effect pedal pressure so you could have got the wrong size. I also think rear brakes WAY out of adjustment will cause a spongy pedal.
I wen't from power to manual brakes and I liked it. FWIW