67 Camaro, auto, p.s. p.b. GM disc on front, brake shoes on the back with a 383 stroker. When I acquired the car the brakes seemed to have a low pedal and pretty soft. What position should the brake rod be in, in relation to master cylinder to brake pedal? Anyone have a picture showing this relationship of brake rod location. How much vacuum should be normal to have power brakes on this set-up.