What adapter are you using? Did your car have manual brakes before or did it have the Bendix Booster, or the Kelsey Hayes under the dash booster?
Does your car have A/C? All of these take different brackets to mount the new booster. I was just interested in which type you are using. Ray used a custom made bracket on Yellow Bird. I am making one using the Bendix booster bracket and a jeep bracket to clear the A/C plenum.