[DrKnow65]

The bowl drain is the brass screw to the left of your missing bolt. The big brass fitting your screw goes in also holds the bowl in place. If you remove the fitting the bowl will come right off and inside would hang the float which levers against the needle that stops the flow of fuel into the bowl (very similar to the float in the toilet bolw). With the fitting out the far end should have the oriface (hole) your needle partially plugs up. If you felt ambitious you could you could bench it and make sure your needle is the correct length.
Your needle looks good but you may want to give it a bit more of a taper, the adjustment will be tough as it will change rapidly with that steep of an angle. Good shade tree work :-)