I just finished putting new seals and a new worm gear in my 33 gearbox, so I know what you're talking about. The worm gear is keyed to the shaft, so there isn't any choice in where the steering wheel ends up, except that the steering wheel has two key slots (at least mine does). You get your choice there. At least that's the way it seemed to me.
That notch lines up with a slot in the light switch housing. If you look at that it will tell you, I'm pretty sure it goes down. I had mine wrong and already had oil in the box when I noticed that.
Did you have trouble getting that seal around the output shaft? I messed up the first one and had to order another gasket set. It ain't easy - is it. Mine has been in the car full of oil for about 2 weeks and no drips so far - it used to leak out about as fast as I could pour it in. The bearing area on the worm gear was bad on mine -from not having oil in there I suppose. Getting that worm gear off and back on wasn't so easy either, it's pressed pretty tight. You have to be carefull pressing it back on - if you do that by pressing against the steering wheel end of the shaft it can bend it.