A picture is worth a thousand words here. Any chance you can provide one?
carb ID tag should be riveted to the carb, usually towards the top (sometimes they are missing, or under crud). There will be numbers stamped in it that will help ID the type and model of carb.
I'm not a expert when it comes to all the various carbs, but to my knowledge (at least on my WD45, which is a project tractor yet so I don't know it well), there should only be the one drain plug (which you found), and a jet on the bottom which is kind of at a 45 degree angle towards the front. I don't think there is any other holes? Someone will correct me if I'm forgetting something.
Regardless, take the carb off, and take it apart and clean it up. If you have never done this:
First, its time to learn how, LOL!
second, it often solves loads of problems, a little dirt makes for big headaches.
Third, its not really as hard as what people make it out to be. If I can, you can. Just take notes of all the jets settings before you move them. Screw them in until they touch bottom and make notes of that amount, so when you put it all back together, you can back them out this amount, and then fine tune from there.
Take it all apart and blow some compressed air in ALL of the passages. make sure that air is going through to somewhere, or you know something is plugged up.
Chances are, you might need a new needle valve, since that sounds like where yours is leaking.
Check that the shafts, where they go though the side of the carb, are not sloppy and loose. If they are, time to order a full carb rebuild kit. leaky seals on those shafts cause problems.
Check that your float floats, and had no gas inside it (because of holes). Once carb is all cleaned up, reassemble float in top half of carb and flip the assembly upside down. Check that float is parallel with the flat where the two halves of the carb meet. once it is, put top and bottom of carbs back together (probably with new gaskets, if the old ones are shot).
Don't be a-scared of cleaning a carb. Chances are, it didn't start good this afternoon because something is wrong with the carb.
Have you gone through the gas system lately? Is the gas tank clean? Fuel filter bowl and screen clean? If not, clean them. heck, clean them anyway! line to carb clean? If there is crud in any of these, it will find its way to the carb and you will be back to square one, so now is the time to check them.
Old tractors take care and maintenance to keep them running at there best, something people often forget until things start going wrong. Good luck and let us know what you find.
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