The SKOSH chart is basically for radial tire use on Mopars. You can see that in the notes on the bottom. With stock components you're not likely to be able to get more than a couple degrees of positive caster. With offset bushings up to about +3.5°. More than that usually requires some kind of tubular UCA.
With the QA1 UCA's you should be able to get up to about +5° of caster without too much trouble. Whether you want that much is up to you, if you have power steering I'd say do it. If you have manual steering, realize that while adding positive caster improves stability it also makes the care more resistant to steering inputs, so, harder to turn. I run +6.5° caster on my car with 16:1 manual steering and 275's up front, so it's relative.
For camber on a street car I wouldn't go past -1°. That's just because more than that will start to show camber wear on the tires. You can run more, but your tires will wear faster.
