Carburetor ID

The answers for the 4bbls are on the front of the air horn/ choke housing. Look for a LIST number and post those Your photos are terribly small. "A wild guess" on the top two is maybe 600cfm

At least one (in your hand) is known as a "spread bore" and were sold as replacements for GM Quadrajet and Chrysler Thermoquads It appears to be a vacuum secondary, and they were made in ? 650 and 850 cfm I think. No idea what they were designed to fit IE the choke hookup and throttle would have been made differently depending on "what"