Blueprint 408 carburetor

Hi everyone! Been away for some time now,but recently bought a 1968 Barracuda with a Blueprint Engines 408. The car runs well except for the emissions calibrated 625 carter AFB. I want to replace it with the Avs 2 but don’t know if I need the 650 or the 800. Car has a 7.25” rear with 2.76 gears and a 904 transmission.

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