Now, I wanted to go five lug with this truck and I had the front cross-member from a '85 chevy truck that I decided to use. I know, I could have used the old cross-member and just used different balljoints and tierod ends but this is how I did it. If you are interested in the many different ways to do the drum to disc swap you should read this thread by lolife99. It says it all better than I ever could.
https://67-72chevytrucks.com/vboard/...d.php?t=444815
It was filthy. And I ain't gonna kid you, getting those springs out was a bear.