It hasn’t sold because of price. It’s more of a museum piece than a functional one. It would hard to have $3500 worth of 1950s aluminum on a shelf for viewing. Just like everyone has said, metallurgy was bad back then and the part may fail if used. I’ve been told the combustion chamber is no big deal. The new castings from the 90s look identical and are built well. The intake and exhaust all need to be fabricated... but that’s better anyway. Make him an offer and put it to use.