A 650 to 700 cfm 4 barrel
the absolute most cfm an engine in your size ,on the road is 585-650 cfm max, anymore is just ego
750 CFM
750
600 cfm will be enough for that engine.
2000 cfm
depends on the application, but anywhere from 600 cfm up to 850 cfm is common. Carburetor manufacturers provide a formula for this calculation.
depends on the use and internal components of the engine.
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.
An Autolite 4300D spreadbore(750 CFM)
25.65
simple rule 1.5 times cubic inches gives the cfm you need so just take 302 times by 1.5 and you will be very close