Carb choice for high altitude?

So it looks like Cudafever and i were kinda on the right track. Did some googling and found a tech article written by a guy who races and restores classic mustangs in colorado... he concluded that because of the lower airflow requirements of an engine at high altitude a smaller carb must be used to maintain a good vacuum signal. According to the article for an engine operating at 5000 ft. above sea level the required cfm airflow of the carb is multiplied by 0.912, meaning my 360 requires not even 600 cfm to make power up to 6000 rpm...

Interesting stuff, looks like a 650DP will be plenty for me