Low idle sould be close to 400 rpm, 425 or 450 is not untypical.
As far as where your lever is set, it's not unusual for the lever to operate on only the upper or lower end of its range. That results from things like wear in the governor, a misadjusted linkage, a different cam on the throttle plate from the original, and so on. You'll find that you have the full range of engine speed, but that each notch is a bigger change than it was designed to be, i.e., you can't make as fine adjustments to speed as you could if everything was in good working order. With a good, tight governor, you can sometimes fiddle with the linkage to get most or all of the range back.
Teddy has a good idea about the idle circuit in the carb being clogged, but it may be as simple as adjusting the idle stop screw on the carb, which physically limits how far the throttle plate will close and keep you from killing the engine.
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