Edelbrock Carb Rebuild

Does anybody know where I could send a 750 Edelbrock carb to be professionally rebuilt. I had a local speed shop do it but it still does not perform right. I hate to throw a $300 carb away but I am afraid it will cost me that to get it repaired. I bought it new probably 5 years ago and it worked great then but as time went on it started to act like a cold engine does when it has no choke(lazy) on medium acceleration. It seems to work fine wide open. I adjusted the accelerator pump but that only helped a little. Thanks for reading.