Edelbrock 600 carb issue?

How old is the carb ? does the car sit for long periods? Mine is the older Carter comp series with a leather accelerator pump and when it sits and dries out it takes days for the stumble to go away till it swells again.Sometimes I have to prime to get it started because of no squirt. I should say that it squirts intermittently or dribbles,not a good strong squirt. Until it does, stumble city. Just a thought.