[DMXF]

Right Jerry, I believe the coolant goes into the water pump via the lower rad hose and then goes pressurized into both sides of the front of the block. From there it will go up into each head, but the water will take the path of least resistance, so the issue is will enough get up into the back chamber of the head without simply going up into the head more toward the front of the engine (the holes more toward the front are relatively large at about 1/2" dia). Seems like the gasket should have incremental hole sizes, like maybe 1/4" up front transitioning to 1/2" at the rear and then the large passage at the very back.