Guess I answered before you finished posting photos. The transom bracket looks like a model C/D. The carb is 1926 or newer. Midsection is model A or C. The tank could be a 1923 model A. I think you have a big collection of bits from several motors.
I’m not as well versed on the 1926 and later light twins. I think the exhaust of the larger model G won’t fit the model C midsection. The bracket that holds the rudder and water tubes is a different shape on the 1926 and newer motors. It’s more of a crest shape than yours. I couldn’t tell you if it’s a model G powerhead, but the rest appears earlier IMO. I could easily be wrong.
Wayne
Upper Canada Chapter
uccaomci.com
