what u give the cylinder has the piston and rings still in it. it just has some surface rust in the cylinder, should be easy to clean it just sat on a shelf for a long time.
that will not fit a blaster and their is no reason why you should want it to, that rust on the liner looks quite severe, you going to have to rebore that with a new piston and rings if you ever found a bottom end for it.
I hear that people have a hard time finding parts for the old yzs, there are a ton of people that live by the old motocross bikes im sure someone could use it... Perfect ebay item you have lol...