All boosters are brand new as is our dual reservoir master cylinders. This is a universal street rod application and has a 4 bolt mounting pattern that is 3-3/8″ square and accepts a master cylinder that has a 3-3/8″ spread on mounting holes. Master cylinder fittings are female and are 9/1″6-18 and the small port is 1/2″-20. All boosters require a minimum vacuum of 18″ of vacuum, your application may require a vacuum pump due to your cam shaft specs. to get you at the minimum of 18″ inches of vacuum. If you have installed an “RV cam” this might be what you will need. We also offer vacuum pumps as well.