I've got an edelbrock air-gap RPM 7501 and I'm curious about one thing now. It has what they call "rear water outlets," that is, the rear water outlets go into a tapped/threaded pipe outlet on the manifold. They're completely independent of each other, no crossover for water to flow from one to the other. There's no mention of the outlets in the instructions other than "includes rear water outlets," but there are two pipe plugs in the box that conveniently fit both the holes. What I'm wondering is if I'm just supposed to plug them up, or should I put in some plumbing to allow water flow between the two? (Simply plugging them worries me a little because this is going on a 383 that hasn't been run yet and I've heard too many stories about overheating-issues) Or an even better thought, would plumbing the two of them into one of the ports at the front water-crossover where the thermostat is be better (so that water would flow into the radiator from all four points on the heads)?
Here's a pic of the manifold with the two outlets in question circled in red: