Hello, I have a 68 Coupe which is an original, factory power drum brake car and feel the need to convert to manual brakes. My questions are: 1) Can I use the original master cylinder which has a "shallow" piston or will I have to locate a "deep" piston master cylinder? 2) Can the studs coming out of the firewall for the booster be removed for a clean installation? 3) Does holes have to be made in the firewall for the master cylinder? 4) Will I have to locate a brake pedal pushrod for a manual brake application?