I've converted my Chevelle to front disc power brakes. It was manual drums. My problem is the rod that installs to the brake pedal seems to be too short. When it's hooked up the pedal won't come out to the rubber stops. It's supposed to have a 1/4 in. of play instead of 3/4 in. short. Its a delco moraine 11 in. booster. Is there an adjustment for the rod besides the clevis that connects it to the pedal?