Elderbrock air gap intake question

Dumb question: WHAT rear water ports? Is this an Edelbrock 7576 Air Gap?

As said, the complete water flow is through the block front to back, then up through the heads, back to front. The front area is the best representative of overall engine temp; I would expect the water temp at the back to be considerably lower, especially if you are hammering on the engine and putting a lot of heat into the heads all of a sudden.