Hi, i have aquired this engine. It has no markings on it. It has a very strange carb with a flat sided spray bar and a weird backplate that goes all the way up above the exhaust port. It's a 40 sized engine. It's got so much compression that I almost can't turn the crank over by hand without a prop installed. I don't think it's ever been ran. Can anyone shed any light as to what it is? Anyone know what it might be worth?

Thanks

Markus