Identifying a Carter Carb

I have a couple of what I believe are the Super six carbs BBD. Id like to identify them specifically for what model and year vehicle they were originally calibrated for.

Does anyone have an old Carter carb book that will do this?

Looking on-line I see information too general. Kits being sold for the slant six versions along with the V-8 version of this carb.

Only one of the carbs had the small metal tag still attached to the float bowl and from what I have read that may be the only carb I can positively identify unless I am mistaken.

Shown below are the carbs and the metal tag.

From what I have read these are super six carbs versus the 318 carbs because there are no holes drilled thru the throttle plates.

Does everyone agree that is one positive way to identify these carbs as slant six carbs? Id like to get confirmation so that I can keep my eyes open for other units whilst I am out and about.

Below are the two carbs in question.

The bodies are marked 2543 and the other 2681. The small metal tag which came off the carb with the screw lying next to it reads 8137S

Thanks for any help in identifying these.