The needle comes out from the front (and top) on a holley. There is a screw on top of the fuel bowl. You remove it, then you can turn the needle and seat out by hand. Blow it clean with carb cleaner and put it back. If you don't get it back into the same spot, you may have to adjust the float (already covered in this topic).
After doing it a few times, it takes 5 minutes. I had to go through a couple of fuel filters before I got the crud out of the tank.
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