Pirate Jacks front disc kit question

I mean, if you guys really wanna do something that shouldn't be necessary for the swap rather than figure out the actual problem, sure, tap the ball joints.

But again, that shouldn't be something you need to do. It looks to me like the sway bar tabs themselves are the issue, whether they were added or need repair, something appears to be "off" with their placement.
When I did my conversion, I used the original control arms and lower bushings. I just had to drill out the lower bushings to adapt to the K & H disc brake spindles. I used all the stock hardware. Been working fine for years. The 69 Dart did have stock 4-wheel power 10" drums to start with and I even used the same M/S and no PP valve (I do not drive it in the rain, so no spin-out). See car in photo.