Welcome. I converted my 71 to front disks before the "kits" were widely available in the 90's. Even then the only junkyard parts I used were the backing plates. I used my original hubs but needed to face the back side of the wheel flange, press in new studs, etc... If I had to do it over today, I would probably order a kit.
If the 12" drums you take off are in even close to usable condition don't scrap them, they're currently hard to find.
There are 2 rules to success in life...
Rule #1: Don't tell people everything you know.
1971 J-4700/Buick 350 Stage 1/TH400/D20/D44/D60/Koenig PTO Winch
2005 LJ Rubicon Pretty close to stock