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@TerrXL
You should probably remove the BB to take a look around before you rule it out. Could be that the rust is only on the outside, in which case a little clean up could be all it needs to be back to its former glory.
If it's not in a serviceable order or you just want a new BB and the current BB doesn't tell you its size, measure the width and internal diameter of the shell then check out Sheldon Brown's BB size database.
I think you can simply keep the old chain rings and lay the chain on the inner one if you don't mind the 'look' of it.