Stumped and Frustrated with a Holley 670 Hesitation

Many say the Street Avenger series is Holleys worst design ever.
I had one, and was in the same position as you. I threw part after part at that thing, and could never get it to run right. Was it operator error, or just a bad carb ? I will never know, but I couldnt get rid of the thing fast enough. Found a like new Eddy 600. Put it on, turned the a/f screws out 1.5 turns, and burned rubber down the street. Not here to bash Holley carbs, but if you do a search on the Street Avengers, you will see alot of unhappy folks.

I have finally settled with a Ede Thunder Series 650 avs, on a mild 360. The carb works flawlessly for what im doing.