Andy, I'm a little confused about what you're describing, so the pics should help. But your comment about the tires causes me to tell you that they shouldn't matter. What you want to do is level the frame itself for your setup process. Since the carb pad should be "level" with the ground at ride heighth some would argue that tire size will matter, but it's been my experience that if you work from a level frame that any slight variation caused by tire size will have little to no affect on the float angle.