Quote: The UCA is redesigned so the upper ball joint is plumb when used with taller knuckles.
you mean the UCA ball joint socket is tilted slightly. So the range of angles the ball joint at factory suspension height is not changed.
But this is not absolutely necessary in reality. But if you were making an new A-arm you should include it and that's why Dick added it. It's a nice to have, but not a must have.
Those UBA ball joint can take a lot of angle. Most every circle track car runs very large angles on those very same K772 ball joints.
