Here's what I had to do:
I was replacing my ball joints with the updated re-greasable joints from Bill Jenkins, which BOLT up into the place of the old ball joints (the old ones used rivets). You must drill out the rivets that hold the old joints to the control arm which leaves the holes for the new ball joint to bolt to.
Once the old ball joints were off, I installed the new ball joints into the bottom of the hub, THEN bolted the ball joint to the control arm. Thats the only way those suckers were going back together.