Thanks to everyone who has commented. I was too brief with details on the first question. The alleged flying flywheel came off a 1930s home made roadster for dirt track racing. Could have been a model A. So the engine was probably original to the car with some modifications. The story goes that in around 1930 these guys were in the yard of a garage arguing about porting or not porting to deal with compression, they revved the sucker up - the engine blew and off went the flywheel - down the street. Thanks so much for the help!