’66 Newport Carburetor

I'm wondering if anyone could give me some advice. My '66 Newport is running pretty rich. The carb was rebuilt about 11-12 years ago and when I go to start the engine while it's cold it'll almost always start for a second before it dies out.......as if there is unspent fuel igniting. When I go to start it after it's been running I have trouble getting it started.............although it's never not started on my. I took some pictures of the carb with a cold engine and after it's hot.......I didn't notice anything stand out between the two. The questions I have are:

in photo 1, the grommet marked "A" stayed open while the engine was cold and hot, not sure if it's supposed close at some point or not.............

in photo 2, the rod marked "B" has some play in it so i'm not sure if that's a problem or not.....of if there is a spring or something underneath the cover at the bottom of the rod (seen with the two bolts)

in photo 3, the "pin" marked "C" isn't connected or tied to anything so I have no clue what it's purpose is............the curved rod marked "D" isn't connected to anything either, other than the vacuum it's running to. It just slides along the groove (the end with the clip on it) and I have no clue what it's purpose is either..........

Any help would be appreciated.............
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Author: 5fty7vn