Choke Thermostat
The original engine in our 67 Formula S was no longer in the car when we got it. However, it did have a bunch of 273 parts in a box. This choke was in the box, and it does not fit a 2 barrel.
I have been told it is probably a 4 bbl choke. If it looks like what you need, you can have it for the price of the ride (probably a USPS if it fits it ships box).
Let me know.