I am def not sn expert on subject…..but I can tell you that looks to be a mopar mega block from around pre 2010 or so. Can’t read the casting date clearly. But the foundry stamp looks like the “Motor” foundry? I have an ‘06 wedge exactly like that and it’s a mega block….pre “World”

Also, factory Hemi blocks never had the wedge style motor mount ears. Only the lower hemi pad with threaded holes.

I believe all hemis also have an oil drainback hole on each deck that wedge blocks do not have.