Darrell, It still can be fun.

I'm just explaining the rules as they have been adopted. Sure the AVS has an easier adjustable air door than the AFB but its a different model. It's like a 4150 holley with a secondary metering block which uses common holley jets rather than a 4160 which uses the metering plate out back. Two different model carbs and I'd prefer one over the other if I had a choice, but that doesnt change the fact that a car with a 4160 should have a 4160.
If ya got the means to swap it for a big AFB then thats probably the best option, if not run it knowing its incorrect to get your combo dialed in then swap it out at a later date for an AFB.
If it makes you feel any better, the GM's and Mopars that were born with a small AFB now have big CFM carbs available thru the aftermarket and a full compliment of tuning parts just a phone call away. Look at guys like Steve Von Ahn who have to tweak an Autolite carb to run the number.
BTW, the reason you write here is because you love this place.

P.S. I would avoid bead blasting the carb. Being aluminum, I imagine there has to be a way to chemically etch or remove the shiny finish without risking blasting debris in places you don't want it.