Carb identification

That is a '64-'65 BBD with a '65 choke pull-off installed. Looks like it might have been "remanufactured" once or twice. Without the tag it's impossible to narrow down exactly what it came from originally (a '64 or a '65, a 273 or a 318, automatic or manual trans, etc), or if subassemblies from multiple original carbs have been thrown together to make one "remanufactured" carb.

Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download.