We need a better picture . That does not look like an old AFB . it looks like the later ones they sold in the aftermarket 625 CFM An old AFM has a vacuum choke with the pipe running to the exhaust manifold or a weell on the intake. There is also a large Idle air adjustment screw in between the two fuel idle mixture screws The last time GM used an AFB on a production cars was 1966 and i believe that only Pontiac was the last G/M division to use that carb . A note here is that they made a small bolt on throttle linkeage piece that when bolted on the same Carb could be used on a Chevrolet . I have one of those universal AFB,s and it came off a 66 Catalina . AlexI’ve got an old AFB with a mech choke that I never hooked up. Can you just buy an electric choke kit and add it on?
I didn’t think it was right. Never had a Carter carb.I'm pretty sure that spring doesn't go there, and it was put there by someone who didn't want to learn how to adjust the choke.
thats a much later aftermarket Carter AFB more than likely 625 CFM thats a good carb not quite as good as the factory G / M ones but they have not been STD equipment in 60 years. Alex