what 4 speed auto transmissions can i use? 46rh etc

So it's not tucked up in where a 727 would be?

The front of the transmission can't changed much ofcourse but it would be nice if the tailshaft could end up little bit higher. About 1" I recall. But that last inch will need more floormods.
If one doesn't 'bash and reshape' the tunnel, the trans will be hanging lower still.

The position of my 518 is good enough for the time being for my daily driving and handling.