Pistons are cast iron, that's what mine looks like and a replacement I've seen.
The carb has corroded like aluminum will with age, I'm sure it's a mess, the guy sells it for $50, not sure what I can get from mine, it's worth not having to deal with it. I read an air filter is needed to cause enough restriction to cause it to suck fuel up into it, plug is easy, it's the same one used in the Model T, but plug wire may be a problem.