You can argue that with Holley:

'Mechanical secondary carbs (double pumpers) are the better option for race cars, hot rods, and performance vehicles with manual transmission, automatic transmissions with looser torque converters, and lower (higher numerically) rear end gears. They are designed for engines that rev quickly, demand air flow more quickly, and are more focuses on quick acceleration.

Vacuum secondary carbs make excellent street carburetors. They open the secondaries progressively and are designed for stock-ish to mildly built engines that are heavy, have taller (lower numerically) rear end gears and automatic transmissions with tight converters. By keeping the secondaries closed until considerably higher load, these carbs also help to improve fuel economy over a similarly sized mechanical secondary carb. Holley has a plethora of vacuum secondary carbs to choose from in small and large CFM sizes.'

www.holley.com/blog/post/what_is_a_holley_double_pumper_carb_/