The thing you removed was probably a hydrovac. They worked well. Is the master cylinder you are using from a pickup or a 2 ton? If its from a 2 ton, I would use the entire system. Hydrovacs can be bought and parts are still available. Unless you absolutely cannot use mechanical linkage for your clutch, I certainly would hesitate using hydraulic clutch. They were a lot of trouble and therefor were only used a couple of years.