I'm about to be 14 and am working on my first car. Dad got me a 67 camaro. It has manual disc on it now and I want to make it power. Can i put a booster and master cyl only or do i still have to change everything?

 

They make kits to change it over if you want to have power brakes. Classic Industries, Rick's Camaros or a number of companies sell them. They will come with everything you will need (master cylinder, booster, lines and proportioning valve). You can do it in a few hours with a little help if you've never done it before. Just make sure you get whatever vacuum connector you need for the booster on the intake.
Then enjoy your power brakes!