Can someone tell me what master and what it took to install in a 70 Chevelle with manual disk/drum setup? I see the Wilwoods, and stock replacements, but I am worried about messing up a working brake system. I have a stock manual drum/drum master in the car and I generally have no problem getting it stopped. I plan on getting into the high 8's soon at probably 152 and the car is almost 3200 lbs. I have been putting it off for fear of not getting pedal ratio or bore size right and winding up with a setup that doesn't stop. It has a stock firewall and pedal assembly if that matters. I don't have the tools to do much fabricating so I need kind of a bolt in setup. Thanks.