Yeah, that cam-shaft is a fun upgrade if you can afford it. So, you're going to do some climbing? The cam-shaft will improve on that, but how much, I have no idea. If you are considering investing little by little, the lifts and new tires are your best bet. My stock 4-door can do some great things without the lift, but there are definately a lot of places I dare not go! Engine performance isn't your primary concern here as I see it. In my limited experience, I have found that the engine performance upgrades free up a bit of horse and thats great, but I cannot go places where a lift and big tires are needed. Anyway....
steveo