Holley Street Avenger 670cfm to big for 318cui?

I will disagree with the other opinions & suggest you swap the Holley for an Edel AVS2 carb.
My reasons?
- main reason is that although both carbs have similar cfm ratings, the Edel has smaller primaries [ secondaries are larger to give the total of 650 cfm]. Smaller primaries, all else being equal, give better response/feel. With the H carb, all four bores are the same size. Plus, the Edel has annular boosters in the primaries. The combination of the smaller pri bores AND the ann boosters will give better throttle response on the primaries, where most driving is done. Fuel economy should also be better.
- the engine is stock. So a carb that 'livens up' an otherwise stock, low power engine will make you feel like the expense of a new carb was worth it.........