ATM/Holley verses Carter 625 AFB

So you picked one thing I said and ran with it. Got it. BTW, if you have the link to what Shrinker said I’d love to read it. All that MV stuff is near impossible to find any more.
I'm just stating the obvious which you haven't figured out yet. A carb will only flow what the engine demands irrespective of what size you put on it. Here's what Bruce had to say about annular boosters:

The more holes the more air to fuel interaction. But having said that the double step design of a dogleg has fuel all the way around the circumference of the booster so what the heck. Each to his own. If you start playing with more holes and big or small drops you will find that some engines need fat drops some need fine drops. It depends upon the heat and dispersion in the cylinder. Cylinders with high heat or exhaust retention make more power with fat drops. Been there, done that, proved that many many times. You have to learn how to balance the speed of vaporization and where it occurs in every engine. They are all different.

The conversation that was had was why one carb (Dominator) better suited one engine over another. What its comes down to is droplet size and suitability to the engine design.

Go look at a Dambest carb and see what he's doing.

No link sorry.