AVS vs AFB

Id go with the AVS. The AFB's were dialed in to the motors/cars they were installed on. IIRC there were over 5000 AFB OEM part numbers with all their jets, bleeds, venturi pod and rod combos. The AVS it the same carb with the secondary adjustable spring door to dial it in further to your specific app. ie. the AFB required you to remove weight from the secondary door by grinding it off the counterbalance if you need the secondaries to come in earlier.