see, that's where I made my mistake... I made the master cylinder mounting tab without regard to how long the pedal extension was going to have to be to reach it. After mounting the brakes worked.... but the pedal only moved about 1/4" down to full lock and it was HARD to push the pedal because of the loss of leverage.
Had I started with the pedal, like you suggested, I would have made the extension much shorter (to match the brake system I'm using) and then fit the master cylinder mounting tab to match. :-/ I made it incorrectly my first try.
Now I'm going to cut the master cylinder mounting tab off tonight and try again!
you have no clue how many times i tried till i got it right, enough to sale to the public, i cashed in a 5 gallon bucket of scrap aluminum, hahahahaaaa