I tried this post in the Brakes, Suspension & Steering forum but I got no response, So I thought some of the Pro Touring guys may be able to help. I have a 67 with a LS3 with custom coil covers and I am getting ready to install my 9" single booster and master cylinder that came with my SSBC. disc conversion kit. The booster just hits the coil cover. I called SSBC. and they said go with what ever fits in a single booster, if I go with a duel there may be clearance issues with the master cylinder hitting the hood due to the duel being about 1.5 longer than a single and the Camaros boosters are tilted upwards. An 8" will clear my covers, I was wondering if any of you are running a 8" duel and how the clearance is on the stock cowl hood thanks.