For dual quad applications, I prefer the AFB. Never liked nor tinkered with Holley's but had at one time owned a pair of modified 660CFM center squirters that I had on a 440 Weiand Tunnel Ram that was going to be modified to fit on my stroked 482CI 409 engine. That's the only Holley I had and never got to run them as I wound up selling the engine and parts.
Setting up my Warrior tunnel ram, I have gone with the AVS2 which offers an annular booster ring in the primaries and the adjustable air valve, like a Q-jet, on the secondaries. If it doesn't work as well as I hope, then I will go with a pair of older AFB's - would really like to use a pair of Q-jets. The quality of the AVS2 looks pretty good to me and the adjustability is fairly straight forward and easy just like the AFB's.
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