You will need a new master cylinder. I'd recommend buying a kit for that too. Go with the power booster also.
I put power disc brakes on the front of my '54 Suburban. I love the way it stops. I used the Performance Online kit for it.
I have also installed a CPP kit on another '54. Neither kit is a bolt in. You will have to do some mods. I had to cut and re-weld both MC brackets to get them where I liked it.
You can read about it
here, about halfway down the page.
