Definitely a TX 440 engine. If you put it on VintageSleds.com , it will most likely sell but shipping is a factor - minimum of $90 to ship it anywhere. Selling price range is probably $100 - $150 (pickup). This is a pretty unique engine and there doesn't seem to be a lot of them out there so there might be somebody willing to pay the price for shipping it. If I were close enough to pick it up, I would for sure be interested. This engine is a beast, as free-airs go. Can't have too many 440 TX engines.