Welcome to the new Wizard Outboard Forum.
thanks in advance only stamp on metal plate '178 2921 A' good compression spark, going to clean the carbs,
clean her up and get her going.
THANKS FOR PUTTING THE PICS IN, I COULDNT GET THEM TO PASTE FOR SOME REASON
Definitely built by McCulloch / Scott-Atwater. Looks like a 7.5 hp. Probably 1959 to early '60s.