On my Hemi the water pump pulley is so far back it covers the water pump bolts...i.e. they fit inside it.
That is what I have been seeing, but I have not found a real good picture of the area, I need to do some more searching. I did find this pic of Max Hurley's Hemi Dart.
That looks like a B/RB non A/C waterpump pulley , the matching crank pulley for that on a stock hemi balancer would be very shallow.