Edelbrock Performer Carb

The Performer's are pretty much just copies of the old Carter AFB's. They're good carbs, nothing fancy though. They are pretty easy to work with, I just finished setting up a Carter Competition AFB for my 318. As far as the on and off throttle issues, I'd check timing to see where you're at both with and without the vacuum advance. Then pull the plugs and see what they look like, sounds like you have some tuning to do.

What size engine are you running, and what size carb?