Two barrels = two holes. The 2V on the aircleaner stood for "2 Venturis". Bolt on replacements: Either a Holley list # 7448-350 cfm 2 bbl, Or the Holley list # 4412 500 cfm 2 bbl. The 500 will give it an up to 20 hp kick in the pants. You can call it a 4 bbl performance enhancer in a 2 bbl package. The 350 is pretty much a stock replacement. Both will bolt on, with only a minor reroute of the fuel line to make them work. Just remember to install an in-line fuel filter between the pump and carb. Once you set it, leave it alone. Only thing that will stop a Holley is water or dirt in the fuel. If it seems that it's gotten out of tune, look elsewhere for the problem ( ignition usually, especially if you're still running points) One more thing: I see you're in south Texas. If you decide on either Holley, get a manual choke model and wire the choke open. You'll never need a choke down there. Paying the $20 or so extra for an electric choke model is a waste where you're at. Me, personally, I take all the choke parts off the carb, including the choke butterfly.
