The only downside to lowering the height of the pedal above the floorboard is the corresponding decrease in the stroke of the master cylinder piston. Being very conscientious about brake adjustment (or converting to self-adjusters) will keep the pedal travel to a minimum. It's not difficult to convert any Bendix drum brake system to be self adjusting.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!