Trying to identify intermediate and high needles on a Winfield 0-620 D. Winfield calls the Model N "non-standard for race cars". No indication of which needle is which on the castings. Assuming this is something like the M Models, the needle on top is the idle since it controls air like the M's. The other 2 needles are on the bottom. The spray tube is a tube within a tube with one needle feeding the inner tube and the other feeding the outer tube. Which is high and which is intermediate? Is anyone running one of these willing to count their turns and save this poor boy a lot of frustration? What are the 2 screws in the bottom of the choke bell for? One shows in the pic, the other is about 90 degrees from it. I can't find anything in the Winfield parts info that would go there. Any help is greatly appreciated!