If you know the span between the holes in the block (or in the bearing) you can measure the span between the holes in the cam. IIRC I looked at that years ago and the time the holes in the block line up with the holes in the cam only for a few degrees. I mean where they are both totally open.
Im not sure but I have at least one other cam out in the shop. So I can compare at least two when my cam gets here. Should be Thursday.