66 Dart GT HT Whatsitgonnabe?

So the casting number is 30787, there is a W in a rhomboid shape accompanied by what looks like a 7.

On the snout of the casing, the numbers 477 are stamped in and on the shaft end surface, the numbers 611 are stamped in.

It sure looks like an old water pump to me but I don't know much, do I.