That does sound low. I would expect at least higher single digits. Can you pull a plug and have a look, maybe post a pic? That's one way to tell if it is running rich.

A related topic - the Edelbrock carb does not usually like the OE fuel pressure - its too high. Does it have a regulator to cut it down to <5 psi? High fuel pressure could push fuel past the needle and cause rich running and poor fuel consumption.