Anybody successfully used a Master Power power brake setup??

Anybody sucessfully using one of these? I finally got the rest of my frontend together on my 73 and went to mount the PB setup, and I can't see how in the world this is suposed to work. When I line up the brackets and the booster, the adjusting rod on the booster almost touches the firewall. Looks like I'm gonna have to go manual brakes instead.