The YF was designed specifically by Carter for the Chevy inline six. It was designed to be a bolt on replacement that offered superior performance and reliability. It was so successful, dealers would replace troublesome Rochesters with the Carter YF, even on new cars.
Dad used to tell a story about that Carter replacement carb. Since he was a Carter dealer, and I've never known him to lie about anything, I believe it. When GM stopped equipping all their Chevy engines with Carter carbs and started using Rochesters as original equipment, The CEO of Carter vowed to sell a million replacement carbs. It took a few years, but when the one millionth Chevy carb came off the assembly line, Carter had it gold plated and presented it to the CEO of GM!
Jerry