Grigg - I would be interested in the 2987s, as I have no sample of this one. The one without the tag is probably an 871 of some vintage, of which I have all of the variants.

Jerry - I am not familiar with these. Manufacturer ? Identification ? As to the BB-1's of interest. My only interest in the BB-1's is to acquire one of each for my article, and attempt to help folks identify them. Here is a link to the unfinished article, with pictures: https://www.thecarburetorshop.com/Carter_BB-1_carburetors.htm

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop