(quoted from post at 20:31:14 07/20/15) Jim, notice that in your second picture the fuel inlet elbow
and idle air adjusting screw are visible with the float mount
to the left? In my second picture the holes for both are visible
with the float mount toward the right. Mirror opposites.
That would make sense for the difference between NAA and 8N.
Not sure why they have the same part number though.
More research required I guess. Maybe the tops are off one
of the M/S TSXU universal models.
The plug was most likely added to replace the screen because
it leaked. Bad idea in my opinion. It is supposed to leak there
if the carb floods. That's why it had the strainer to begin with.
If it were flooding and leaking, something else was wrong. An
open hole would work better, but it would suck dirt in if left open.
Looks like the choke rod stop peg has been replaced with a
machine screw too but unless they damaged it, that probably
won't hurt a thing.
Anyway, where to go from here? I have the main nozzle you
need I think. The needle too if needed. I would gladly give
them to you if they'll help. Were your original ones damaged?
If not, they might work just fine also after a good cleaning.
Here's a picture of the bottom of the same red one I posted.
Looks to be the same number as your bowl section.