Even though my spindle is flat like a 10 inch, the mounting bolt to the upper control arm is a larger diameter than the mounting hole for a standard 10 inch MOPAR spindle!!
you have a disc brake spindle, which means it takes the large ball joint so the hole for the upper ball joint stud, as well as the lower ball joint bolts will be bigger than a drum spindle, which takes small ball joints.
i don't see a cobbled together system. i see some people that don't know how to properly identify parts, and not to be ticky-tacky, use proper terminology.
i fail to see how changing your upper control arms has any effect on the wilwood install unless you are also swapping the spindle.
anyway, hope you figured it out and don't have to go thru the rigamarole with that again.