You might try flushing the needle and seat by removing the and pluging the fuel line, idling the engine till it dies, then reconnect fuel line and restart. I mentioned checking the floats because a leaking float will also cause flooding. A pinhole leak on the top of a float in a new Edelbrock carb I installed in April began to cause flooding stalls after four months and about a thousand miles. A good float will make a "hollow" ting ting sound when tapped lightly with a small screwdriver. A leaky one will make a more dull sound. If you remove the float and shake it you can feel and hear gas sloshing in it if its leaky. I'm not familiar with Holley carbs, but if you remove it to check the floats get after the float needles and seats with carb spray and compressed air. If its still under warranty, it cant hurt to call Holley before you open it.
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