Yeah, if you have the Bing CV type carbs, they are pretty much self compensating for altitude within normal operating conditions. You will experience the loss of power, but no tuning can restore that power - in simplistic terms, it is a function of the lower atmospheric pressure and the resulting lower oxygen going into the motor as altitude increases.
Merritt Island, FL
When a person asks you for advice, they don't want advice. They want corroboration.