there is no easy way to find out what came in it. jeep has changed owners so much that no one kept the records, it always seemed to me when trying to find info.
it would probably be better to take a picture of whats in the engine bay and what transmissions/t-case is on it.
tons of people swapped chevy motors in but i have never heard of anyone putting a ford carb on top of it. those jeeps could have easily come with a factory v8 from amc/dodge and people put ford carbs on those.