I got a chance to wrench on the carb tonight before it started to rain. I verified the transfer slots on my primaries were way too open, about a 1/4 inch. I squared them off as well as the secondary slots as per Holley tech support and it was running way too lean that I had to have the mixture screws out 3-4 turns for it to run good. Shut the secondaries closed like it came from the factory and it ran much better, but had two have the primary transfer slots open about the size of two squares. I noticed something new tonight though. When I turn on the headlights on, especially the high beams or turned the AC on while the engine was acting up, it magnified the stumble and the engine would die. Do you think the alternator, voltage regulator, or battery could be causing this problem? It will be a couple of days before I can get back on the car, so plenty of time to come up with a plan of attack. Thanks everyone!
