You can't see a lot in that picture, but it says a lot. You may already have a Duraspark II distributor. The rotor is not from an early distributor. The log on the head may be later 250 head, but would need to see date code part number on the rear-ward side. It looks flattish like the 250 head, but may not be as flat as I think. The carburetor adapter appears to be for a 2100 style Autolite or a Holley 2 barrel, so it would need some slight mods to adapt the Weber. The biggest tell of what "may be" inside is based upon the Clifford 6=8 valve cover. You may have a real jewel there, or someone adding bling. Look in the exhaust port and see if they put the port divider in there, or if the 3rd and 4th exhaust ports are on huge opening.
Do you plan to just run the motor as is or look under and in to see what you really have?
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