Upper control arm now won't fit

You want as much positive caster as you can get with radials. That's why it is best to set the front cam all the way out and the rear all the way in (after setting ride height) and then moving the rear cam out until you have about half-degree negative camber. That is the most positive caster that you will be able to get from the parts on the car. Then set 1/16-1/8" toe-in.