whats wrong with my brakes?

[67_camaroRS]

1967 camaro, Running disc brakes on all four corners, Wilwood 6 pistons on the front and 4 pistons on the rear. Stock steel brake lines and Wilwood flexlines. I have a dual diaphragm brake booster. I'm not really sure what master cylinder it has on it though. I'm running a BB 396 with a big cam. The car just doesn't stop quick enough. for all that brakes I got, I feel like the car should stop faster and on a dime . I bought the booster and master cylinder as a kit a while back and I don't remember the specs. I don't know much about brakes and all that jazz. I just remember somebody telling me to remove the proportioning valve and that will solve my problem.

thanks, Albert.