72 duster 9' drum to disc help

well i was able to make back most of my money with selling the existing wheels and rims i have and have four 15x7 cragar ss 08/61 4 1/2 backspacing with 215/65/r15 upfront in rear 245/60/r15. today i order the wilwood disk brakes. the valve im not sure of how to install or adjust it to be right you knw? i have 11 inch rear drums.