my 1969 chevelle ss has power front disc brakes.the master cylinder has gm number 5460848 and a dw stamping. this is not correct i have been told. i believe it should be gm number 5460309 with a ba stamping. also the brake booster has a 0748 stamping and i believe it should be a 9391 stamping . can anyone out there tell me if i am barking up the right tree or not/ the car is 375hp 396ci car with aluminum heads . thank you .mark i