Maybe someone with Wilwoods will chime in but I believe the Wilwood brake kits do use the OEM 10 inch drum brake spindle. If you have a 68 Cuda, that year drum spindle would have the small upper ball joint so you could still use your existing uca’s. To go big ball joint you would have to use 73+ drum spindles and uca’s, or I think Dr. Diff still offers a sleeve that will adapt a big ball joint to a small ball joint uca.
