As others said, you've screwed the needle valve down too far. You can turn it back up to where it belongs, about 1/2 the thickness of the nut.
I don't think it damaged anything, but may have bent the float.
The reason the bowl needs to be drained before adjusting, is when you turn the needle down, you are pushing the float down, displacing fuel already in the bowl, so it comes out the level hole.
Try adjusting it again, but be aware you can only raise the level. Once up too high, then turning the needle in will push the float down, giving a false reading.
If you do manage to tune the Holley to the point you are happy with it, keep your eyes and nose open for fuel leaks! They are notorious for leaking both internally (gaskets and power valve) and externally (gaskets, orings, and accelerator diaphragm). Many a fine restoration has been destroyed by Holley carbs.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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