Sizing carburetor

Just so ya know, mopars 1970 Hustle Catalog recommended the first improvements be 3310/780 Holley, LD-340 manifold, Hooker under chassis headers.
It was my understanding that the bigger intake valve was because, like a piece of wood, after combustion, the residue volume of air/fuel is far less, requiring a smaller valve.
I'm sure there will be differing opinions.