carter AFB carb.

GUESS WHAT I FOUND!
i found a carter afb 'compeition series' carb in my girlfriend's brother's old blazer, it was in the floorboard. he said it was a 650. on the front of the base of it, it says '9605S 1154'
i know this is more of a statement than a question...
ok, how about this, anybody know anything about this carb? its obviously not new... since carter doesnt seem to make carbs anymore.
i may use this piece later, it doesnt look like its in bad shape. but im sure id rebuild it before using it.
where does a 650 fall on power levels supported? how can you tell the difference between a mechanical and vaccuum secondary?