Stumped and Frustrated with a Holley 670 Hesitation

Oldmanrick, ya i have given up on the secondary side and thinking this is all the primary side. I'm starting to think at this point its junk also. The more I research online the more horror stories I read about these. I guess that is what I get buying a refurbished carb from them. Its just to bad I have no idea what's wrong with it and I don't know if rebuilding it would be worth it? I wish I had a spare carb just to try. I've been looking at new carbs but I have no idea what to get at this point. Grrrrr