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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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