Planning ahead for high altitude driving

[farmputzer]

I plan on driving my 30 Model A to the National club meet in Colorado in June. It runs very well here in Minnesota both summer and winter, averaging 16-20 mpg depending on touring or parade. Totally stock, rebuilt 4,500 miles ago. While in Loveland, I would like to go further up the mountain. What should I plan to do to the carb/engine to make the climb?