Hello, I used a Wilwood 1 1/8 bore master. From what I seen a 1 inch or less would make the pedal more touchy. On the Throw out bearing, I bought a whole kit from keisler ,instead of trying to find all the right parts to make it work. I'm running a Ididit column ,I plan on installing a EZ wiring universal 8 ciruct harness .The hydroboost plate I made myself on my mill they are 1inch thick and can clock the hydroboost unit at 180 .I made them to fit the firewall of 70-74 Mopar e-body and 68-72 b-body I made 4 extras to sell they are available at
http://www.custommachinecomponents.c...at=Mopar+Parts My company makes lots of unique prototypes (mostly specialty tools for vintage cars) Having this equipment is a plus