Help understanding carburetors - metering rods and jets

The AFB style carburetors are better for dual quad applications. But for single four, they are not even close to the AVS, IMO.

Don't get me wrong, l love the AVS , in fact I have 2 of them sitting right here waiting their turn to be ran and tuned. I have always preferred them since the good ole days. It has only been in recent years that i started messing with the AFB performer series and I am really liking them for every day use as well