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I would say a 500 CFM but no bigger than a 600 CFM.
I don't know if you are looking for an answer on flow (CFM) or just a generic answer like "two barrel" or "four barrel".
As I recall, in 1963 the 283 was only offered with a two barrel carburetor. I believe the rated horsepower was 195. The carburetor was either a Rochester or a Carter. Flow was likely not more than 400CFM.
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