Edelbrock Air Gap on Magnum 318 Problems

Like mentioned before, I doubt the intake has anything to do with the stumble, If it did, then throwing on the single plane would only increase the issue. It sure sounds like a carb issue. Do you know anyone with a good working carb that you could throw on? That HP 650 that you have there is pretty beefy for a 318 (depending on internals). Do you know how much horsepower and torque you are putting out?