Casting numbers locations, engine identification

[Eakinsk2010]

I have no clue what engine I've got. All I know is its a v8. The PO told me its a 327 that was dropped in, however, most of the stuff he's told me has been false.

All of the searching I've done has told me to look at the ledge behind the heads for the casting numbers to identify my displacement. But when I went to go check it out, I discovered there were no "ledges." Where the valve cover meets there is a straight drop off, no ledge.

Does anyone know where else I can look to find these numbers?