Hey there - joining with a 68 C20 Project

[rpmerf]

Some thoughts.
I am still in the 'gathering parts' phase of swapping my 1970 C20 to disc brakes. I am using parts from a 83 C20 with the JB7 braking system. I will be buying most things new from Rock Auto. You can get everything you need from Rock Auto except for: Spindles, Proportioning valve, and the center link if using 73-87 inner tie rods, or conversion sleeves if using 63-70 inner tie rods.

Be sure to know what you are getting. I see the kit does not include a booster, master cylinder, or proportioning valve. Master is typically different for disc to at least allow a larger reservoir for the calipers. Proportioning should be different with discs. Wondering what inner tie rods they have since 73-87 inners will not fit your center link. Might use 63-70 inners, 73-87 outers, and conversion sleeves.

While you are in there, I would replace the control arm shafts, idler arm, and pitman arm, just so you know everything up front is nice and fresh. If you still have a 4.5 turn steering box, a 3.5 turn makes a world of difference.

For rims, it depends if you want to go new or used. Used, most 8 lug rims should fit, so you can find them used from a newer 3/4 ton truck. Make sure you get a rim at least 7" wide if you want to run 33x10.5s. 6" wide rims aren't recommended.