My '55 Thunderbird has lousy brakes.  I've rebuilt or replaced everything from the master cylinder to the brake pads.  I have a good pedal, but the thing just won't stop like I want it to.   I know I can convert the car to disks, but I don't want to butcher it and I definitely want to keep the stock wheels. I'm thinking about installing a power brake booster kit.  Does anyone know what I need?  Will this make things any better?