Another New Episode of "What's this part !"

Carb is 1966 or older slant six. Cannot determine the exact application with out the tag number. Just an FYI the carb for the 170 had a smaller barrel/venturi than the 225. I would have to look up the exact size.
Edit: let me clarify that. The 170 standard shift engine had the smaller carb. The 170 automatic had the same size carb as the 225 stick and auto.