Rough alignment after front end rebuild

I've got a dumb question about doing a rough alignment after a front end rebuild. I want to get it in the ballpark so I don't trash my tires on the way to the alignment shop. I can see one wheel has positive camber. Can I move the upper control arm eccentrics with the weight of the car on the wheels, or do I need to jack up the front end? Obviously, I would loosen them first...

Thanks for any input!