Questions about a disc brake conversion on a 69 K10

[RossRinSD]

So, I'm building a 69 K10, and interested in doing a disk brake conversion. I happened to pickup a rebuilt Dana 44 out of a 1981 K20 complete with disc brakes.

Am I on the right track?

I'm assuming I should also pick up a master cylinder for a 81ish K20. And probably the front brake lines and proportioning valve.

Any idea if the current brake booster is good to go?

I noticed that there are sometimes different piston sizes in the master cylinders available. What should I be looking for?

Hey, thanks for the help guys.