What type of Toilet Tank-to-Bowl Gasket? And can I use this tank anymore?

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Cherokee

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I have a three-bolt tank for an unknown toilet. The bolts were badly rusted and one was leaking. I'd like to replace the gasket and bolts and keep using the toilet, if possible.

I'd like to know:
1. What is the material still around the pipe on the bottom of the tank? After removing the gasket and cleaning the area with a wire brush, it doesn't seem to be gasket material. Is that a disintegrated nut or some kind of attachment?
2. Does that material need to be removed before I put on a new gasket, or it actually holding the flush valve on?
3. What kind of gasket do I need? I measure 2-1/4" as the inside diameter of the flush valve (from the bottom)?

I don't know what kind of toilet this is. I see a stamp with a 1957 date in it-- the year this house in San Diego was built. It could be a Western Pottery, but maybe not. I'm also not sure if the tank matches the toilet, since when I took it apart, I noticed the tank was leaning way back against the wall. Maybe that was due to to the disintegration of the gasket, though.

I'd appreciate any help you could give me.
 

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Good point. That material might also have been used to build up the base.

However, I did notice there was a separate gasket there before (which I removed). See picture.

I'm going to a plumbing supply this morning and see what they have.
 

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Looks like a standard gasket size for an old toilet. Replace what you have with
a Fluidmaster Flush valve replacement kit and the gaskets are included.
 
Thanks everybody for the input. I figured it out, with the help of another guy who happened to be in the plumbing supply when I was there. I had already taken off the old gasket. The material underneath was the corroded remains of the nut that held on the brass flush valve. He thought I'd have to drill/dremel a hole in it to get it off, but I was able to do it with a hammer and chisel. After the old material was gone, a few gentle blows knocked the old flush valve loose. Nice piece of pipe made of brass, by the way.

Got a plastic flush valve, new flapper, gasket, plus a Lasco tank seal kit. Put it back together. Next time I'll try the Fluidmaster... just bought one of their fill valves a month ago.
 

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