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CUCV's have no tubing in the rear of the block. Just a cast hole in the rear of the valley under the intake manifold. And any leak is going to leak more under pressure. Pressure test the engine and check where it is coming from. Good Luck. The pressure test will tell all.

Check closely in the valley below the intake manifold. Is it wet there? And check all the coolant sensors and plates that cover holes in the rear of the head on the right side. Does the cross over coolant manifold leak? I would go there before I got to excited. Good Luck. Report back.