Fuel problems and Question

[Domino]

I have a 30 Fordor that just stopped running and acts as if it was not getting adequate fuel. I cleaned the sidament bowl ( just a little rust in it) and still litle gas flow. So I drained the tank - removes the valve under the tank) and flushed multiple times over the past two days straining the gas through paint filters. I am amazed at the amount of rust I removed. Poured about half of it on a paper plate to show the amount. There was/is so much rust in the tank that the gas turns a dark tea color - picture. Trash seems to be out of the tank so I reassembled the fuel line and have gas flow to the carburetor. I pulled the carb to throughly clean it and noticed a strange black substance on the side of it - see picture - which I can't identify. Any guesses as to what it is?

Anyhow, I'll clean the carb and see if she runs. BTW, I drive this car weekly and a monthor so ago completed a 150-200 mile tour in it. I'll report the outcome later.

It seems a little rust can stop an engine dead in its tracks. Hope Pictures post.