Stumped and Frustrated with a Holley 670 Hesitation

Well, I talked to the gentleman that runs a local carb shop. He has been working with me also to try and figure out this situation. I informed him today that the nozzle increase didn't help. He offered to build me a carb suited for my car to try, hoping that what he builds me will solve all my issues. He said if the carb works he will work with me on a good price. If it doesn't work he will keep working on one that does.

This guy has already spent couple hours under the hood of my car helping me out trying to narrow things down, and hasn't wanted a penny for his time. I've tried paying him and he refuses. I have to say that his offer to build me a carb, not just grab one off the shelf and sell it to me and not guarenteeing it works is quite nice!

So I have to get ahold of him Friday and I believe I should have some new results for you all this weekend. I'll keep you guys posted.