Dokkema....I didn't mean to jump in over you in asking Todd about my situation, but I think you & I have a similar situation, but yours is greater (500ft to 8000+ vs 1600 to 3500+). After watching Todd's carb kit install video, it looks like "air jetting" really makes sense. I would probably open the TPI slightly, if at all, in Montana, but you would definitely open yours much more in Colorado. Sure beats messing with jets (which I wouldn't trust myself doing). I imagine you are appreciating that "World Book" of info as much as I.