Disk Brake Conversion Advice

Thank you for the pics.
So looks like I still need the lower ball joints
and upper control arms.
Any disks available with 4" sbp so I can use
the wheels I have.

This is one of the damned if you do and damned if you don't situations. Unless you can find a donor car laying around that you can out your hands on cheap you are going to fork out some money.

The Kelsey Hayes lower ball joints have larger mounting holes for the spindle so you either replace them or drill them out to fit.

Like crackedback said you can buy sleeves and the proper hardware so you can use your existing UCAs from Dr. Diff for $50.00 a set plus the ride.