That Wilwood kit is for an A-body drum brake spindle, and what you have there is a B/E body disk brake spindle. That Wilwood kit will simply not fit that spindle. You’ll either need a Wilwood kit for a disk spindle, or just the rest of the Mopar disk set up.
Your interference point in the UCA mount is common with tubular UCA’s, you can clearance the UCA mount so that the UCA will fit. It’s required with most tubular UCA’s and has been done by lots of folks
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The gap between the bushing and the UCA mount will close when you properly torque the camber bolt, as long as the bolt doesn’t run out of threads which has been a problem with some aftermarket camber bolts.
