70 duster 3 speed on floor

Not sure but I do know my 70 duster was born with a /6 and a 3 speed. My confusion comes from the fact that the car has a four speed hump on the floor that appears to be factory based on the welds. However, the steering column that was in the car looks like it was a 3 speed on the tree, based on the hole in the one cone part of it.

Problem with this car is it appears to be a collection of parts put together as there are several things that just don't add up on it!