Edelbrock 600 carb issue?

The carb is about 6 years old and has about 20k miles on it. This is one of two daily drivers so it doesn't sit for more than a day or two at a time without being ran. Gas tank and fuel lines were all brand new and added when the carb was installed. It ran great up for years until about two weeks ago when this started. Fuel filter is clean. I did have to recently replace the vacuum advance can but that has had no effect on the stumble/hesitation either way.

Will report back with a plug reading once I get a chance to pull them. Working on this thing on my lunch breaks so would like to try the easy/quick suggestions first before taking the carb apart.

Thank you!
-Tim