Wow, Ben, what a find!! It just goes to show there are still plenty of hidden treasures out there and that it pays to ask about these things at estate sales.
Is rust inside the dryer a concern if the pilot light had been burning for years? I don't know, well, anything, about gas dryers (Hubby barely trusts me with electric ones...).
Have fun with them!! Can't wait to see how the washer progresses.