My grandpa had an AY611 engine in his garage when he died. My dad gave it to me to sell. It has the 3speed transmission on it as well. The date 17-8-70 is stamped on the engine. It turns over and has compression. Any idea what it could be worth? I'm a little lost trying to sell it. I'm in the Midwest United States. Any help you could give would be appreciated. Thanks!