this is my 03 mustang hydroboost setup
and i found coupeguys thread, not the one i was thinking about but close
he cut off the bottom of the mc and used the pedal, swing arm and the stock pivot points
then mounted the hydroboost on a simple bracket behind the mc and used a heim joint inbetween
simple and effective; this is the way i'd go
this is a link to his thread posts 53 to 60