727 Dust Shield Small Block

I just put the 904 shield on the 727 shield and the only real difference is where the starter is located. On the 727 pan the top of the starter opening is about 1" down whereas the 904 opening is almost 1/2". Size wise there almost identical.
Boy, that doesn't make it easy, lol. By looking at my picture can you fathom a guess? Thanks by the way.