perhaps, though unlikely, somebody glued them together.
there are 4 locating pins on the bottom of the bowl which engage 4 holes in the throttle body base. So you want to be careful to not break those off. I would keep soaking it with solvent, not carb cleaner, and occasionally while holding the bowl right side up, tap(judiciously) downward on the carb throttle body base corners with a small copper, or other non marring hammer until it releases.
