If I were you I would try and go all new parts on the conversion. I know gbodyparts.com sells the whole conversion kit for $350. I believe that includes the vacuum block with the extra nipple, a check valve, new master cylinder and brake pedal. I had a friend who went to the junk yard to buy the whole unit off a 86 Regal. After about a week he was coming to a light and his master cylinder took a crap. He ended up going through a red light. Lucky no body was coming the other way. I changed only the the motor because I am selling the car and it only cost me $160. for the motor.