.9 or .5 tall upper ball joints in stock geometry upper control arms? Which one?

[Eric B]

I have stock dimension non adjustable tubular upper control arms on a 72 GM a body. I want to run tall upper ball joints. Can I run .9 or will I run into geometry issues? Should I just stick with .5 on stock geometry arms?

I don't want to run the tall lowers because I don't want the car any lower to the ground.

This is a street driven car I am looking to improve the handling characteristics on.

[69cutlassrkt]

I believe you are suppose to run a shorter upper a-arm with a taller ball joint. They might be some drawbacks running a regular length a-arm, surely someone else can give more input. For example my a-arms have ram air restoration ball joint extenders and now my upper a arms are always tilted up.

[Eric B]

I think there are plenty of people running the .5 on stock arms without issue. I guess my question is can I run the .9 without issues on the stock upper arm....