Adding a long arm kit to the Dodge and just trying to find out how to set the caster once I have the long arm on. Anybody have any front end skills that might be able to start me in the right direction? Or would it be better just to get it to the front end shop once I'm done?

To set caster, I use a method known as T.L.A.R. (That Looks About Right)

Then, if it pulls to one side, I tweak it and see if it gets better or worse. Not the most efficient way, but the Flaming Marshmallow goes straight when I take my hands off the wheel.

are the arms adjustable? if so stick an angle finder on top of the upper ball joint with the dial on it facing the wheel. it will show you what your caster is.
Yea the arms are adjustable