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Its going to depend on the condition of your springs and such. As they sag over time you will be changing the camber, the bushing is there to correct that over time.
Check the bushings where the ttb's mounts to the front crossmember also. If these are worn,it will drive you crazy trying to set the caster/camber. If they are worn any, even the slightest movement of the ttb will change your c/c.
I do not know the stock degrees (it is not much) because I do not have my reference material handy. I see you only have 57 posts so instead of torturing you with a dozen more questions, I assume you need them for a lift or bigger tires (35" plus).
3 degrees are the most popular and should work for anything. These on E-Bay will go to true zero and 3.2 degrees. Price seems good.