[lolife99]

Just remember that tie rods and ball joints are different between the 67-70 trucks and the 71-72 trucks. So is the center link and tie rod sleeves.
Engine frame stands are the same. You will need the disc brake prop valve since your 69 is just a distribution block.
M/c will need to be swapped to the disc brake version. I suggest a 71-72 model or aftermarket.
Personally I wouldn’t change the crossmember itself unless you plan to use 71-72!steel brake lines. They route differently to the front side.
But there are ways to address that without swapping the crossmember itself.