Difficult to get A833 four speed into reverse

That is what I was told. Is that an impossibilty?
Not sure if it's impossible but the A body 833 trans is much shorter and the shifter location is closer the main body of the trans. The B&E body trans shifter location would be in the rear tailstock. Someone could have swapped out the tailshaft and that's the only way I'm aware of this transplant working ?