Why wouldn't they be? AFBs have been mixing air and fuel on engines for 50 years or more, and in some pretty high performance applications.
People used to say about the dual quad 409s that nothing compared to the roar when the two AFBs opened up.
I'm sure the same could be said about the carbs on 421s or 413s or 425s, etc.

I have a brand new 9410 that I bought for a Landcruiser project, it's waiting its turn.

Kudos to Edelbrock for keeping this seminal carb line going into the new century.

R.