Yeah, likely a casting/forging #.
Whatever they are, how does it run on pump 92 ?
The Hemi chamber is inherently octane-friendly compared to a wedge chamber; I ran 10.8:1 forever on pump gas, 36 mech + vacuum, no problem, though that one had a fairly large old-school cam.
Hemis like CR & fuel, basically.
I've never understood why some guys would run 9.0:1 in them, unless they wanted to run 87 octane.