Whats the difference ? 4150 question !

Agree with PRH, marketing strikes again. Holley came out a while back with a new hi-zoot carb that they called a (something) 950., hoping the customer would assume it was a 950 cfm carb. It had the same throttle size and venturi size as a 750. Cause it WAS a 750. The 950 name was marketing.