Dayclona, I read your email but have a few questions. I am currently installing a manual SSBC force 10 4-wheel disc on my 69 superbee and had read all of the issues with the supplied brake booster. I was considering using the Wilwood cast aluminum booster which provides both a 7/8" bore and clean good looks. the issue i believe is that the brake piston rod does not snap/click into this booster like a normal chrysler M/C. Is that correct? If i were to use the wilwood M/C can i still run without a proportioning valve. I had actually never heard anyone suggest not using a proportioning valve, but i would like the idea if it is sound from an engineering standpoint. Please advise.