Would a 727 out of a 77 Van work in an A body?

The better news is, they may actually be built a bit heavier duty than the car transmission. Like better/more clutches, or better bands.
The van/truck ID is there is a hole at the top of the bellhousing area, for timing. Ya can't get a light on the crank easily when it's in a van situation, thus the hole.
Good luck!
alan627b