750 Holley vs avs2 650 cfm carb for 340?

I put a 650 AVS2 on my 340 this spring and have been very pleased. I've got a stockish cam, Air Gap intake, and headers. Response is snappy, was easy to set idle air mixture and idle speed. That's all I've done. It does have a slight flat spot or hesitation if you stand on it in some instances but I haven't dug into it. I'm holding off playing with it too much until I get a new cam and heads on. It drives great as-is, isn't stinky and the plugs look great.