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I am also running dual 94's with a 3/4 cam. CharlieNY recommended blocking off power valves (he has proper plugs) Can't remember the jet size off hand, but there are not any of the symptoms you mention you are experiencing. I am also running one of "Bubbas" GM Dizzies.
Did you use a "Unisync" to balance the carbs? Great info on this forum on that.
Keep us posted.