Ok it's looks like a early model, most of them are 575cfm's, I can not see the numbers on the rightside flange, what are the numbers?
and what are the numbers on the tag?
because the flange is the model of carb and the tag is what revisions were made during the production process, this is what I was taught about them.
It looks like a 4200S carter AFB, it's around the 1960-62 yrs. because of the secondary venturis are still on the side of the bowl, not toward the rear.