The notch does orient the cam ring because there is a small pin that fits in a hole drilled at an angle at the bottom of the recess for the cam ring in the housing.
A small pin that it is easy to miss if you don't know it's there and will just as easily fal out and get lost.
OK, I can't find the pin that holds the cam ring in place. I have a rebuild kit. but, it doesn't include that pin. Does anyone know where I can get one?
Also, I'm assuming that the cam ring fits with the notch down in the front half of the housing.