High mount water pump body/timing cover???

I'm not sure the timing cover is off this engine originally.
The block looks almost torquise, whereas the timing cover is much more blue.
It didn't include zhorst manifolds, and the intake is the same as all the other car ones I've seen.
The only numbers I could find stamped on the block were F6P5816. And they were on the pad at the rear of the left bank. There were no numbers on the pad down by the pan rail on the right side. I think that must be the difference with Aussie vs US stuff. A 340 I checked recently had numbers down by the pan rail.