AVS vs AFB

Both good carbs. The AVS has a adjustable secondary valve for tuning.
Now this was back in 1976, I was running a stock 69 440 Charger that had the AVS.Can't remember what the size is factory. Let's say 625 CFM. Got a Carter AFB with the same size throttle plates and bolted it on.Ran the car and it ran within 100th.Granted to say they are damn close to being the same.