Eddy vs Holley CFM ratings?

"engine technically becomes a 550 cfm carb"

Disagree in a big way! A particular engine will consume that much at max but it is not a carb or becomes a carb.
The carb is a carb and the engine below it is the engine, not the carb, never a carb etc....

This is so wrong.

What I mean by that. Is this won't be mathematical accurate just for e.g..

But say your engine is a 360 has a VE% of a 100% at all times (its a magical engine lol)
And makes peak power at 5300 rpm if you use that formula it will add all the intake strokes at 5300 rpm and give the total volume of air that engine will consume in 1 minute. CFM. Be about 550.

Now if you put a 390/550/650/750/850 carbs on that engine that vacuum will change for each one. Just a guess here but say 2"/1.5"/1.25"/1"/0.75" now if you test each one of those carbs at that vacuum level that carb would flow 550. So a 390 @2" = 550 cfm, [email protected]" = 550 cfm, [email protected]" = 550 cfm etc..
Now like I said those numbers are mathematical gibberish (didn't have time to throw everything into formulas so they would work out) but I think you can see my point. I bet if some one with a dyno test a bunch of carbs like that they prove what I'm saying.