I found a picture of my stock. The cutout that I think you are seeing is in fact a cutout for the bolt release, not the ejection port.
If you can enlarge the pic I think you can see it. The ejection port should sit right along the top edge of the stock, regardless of left or right. See brasse's thread entitled "how much free floating needed?". He has an excellent picture of a similar, but not exactly the same, stock with a standard action in it, and you will see what I mean. I'd post his pic here but I'm not sure if that's a good idea without permission.