That also has a high casting number and the later model heads like the #302's. (see the AIR ports ) I don't have that block number on my list but it could be a roller cam 318 block.
The ad said 714 heads, but i can't see those numbers. Yes, air ports by the exhaust, and i was wrong about the dog bones. Although I still can't see them, I can make out the tip of the spider bracket that holds them