Carb choice for high altitude?

MOPEkidD-3 said
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
Click to expand...

When I lived in Colorado (racing at Bandimere), I used a Holley 650dp on my mild 360 (eddy heads, 509 Mopar cam). I did a Proform main body swap on the carburetor to make it a 750dp and the car picked up 3 tenths and 3 MPH right off the bat. It picked up a little more after tuning.

Your article sounds logical from a drivability stand point, but the drag strip results speak for themselves. I would go with a Holley 750dp carb with the HP style main body (no choke horn) for max power potential.....IMHO.