Well you might want to reach out to TUTS 59
He just went to the Moultrie swap meet and posted this in his Moultrie swap meet thread just this week like yesterday
"I found a Rochester B that I believe may be a 261 carburetor. I did a little research and brought it home for $20.00. I picked up a couple of horns, both work and have a great tone, $5.00 each."
https://www.stovebolt.com/ubbthread...ing-swap-meet-april-4-6.html#Post1543055