68 a body upper control arm threads whats enuff

You mean for the ball joint? Ball joint threads are an oddball knuckle thread to start with. If you can get the old joint out, thread the new one in and see if you're comfortable with it. The upper ball joint doesn't support the weight of the vehicle, so you don't have to worry much about the ball joint being pulled out of the control arm. Still, you don't want any play there.

If your control arms are iffy, put a post in the "wanted" section.