[dsraven]

if changing the length of the pedal, so it is closer to the floor, you MUST ensure that a full PEDAL STROKE cycle will result in a full MASTER CYLINDER stroke. especially if you are running drum drakes anywhere in your system. if this doesn't happen, full stroke of pedal equals full stroke of master cylinder plus some room for component wear, floor coverings under the pedal etc, then your unit is really not safe and legal to drive on the roads with the rest of us. just think about it for a minute, one thing that you must not mess with is the safety items on the vehicle. brakes and steering are a couple of the most important ones in that category.
if the pedal height is too high and you want to lower it then the best way to achieve that is for you to configure the geometry of the linkage to place the pedal at the height you want it and also allow for a full stroke of the master cylinder before the pedal hits the floor.
please seriously think about what you are doing when you modify a safety system that has the potential to cause injury or death to you or someone else if something were to go wrong. yes, it will work great under ideal conditions when everything is adjusted correctly etc, but it isn't usually ideal conditions that cause accidents.