It's possible the intake manifold is over tightened. If I hadn't seen it myself I wouldn't believe it but sometimes if you just back off the bolts on front of manifold and snug them back up it can stop a leak. Water leakage is more common at that location from overtightening.

I've also seen that the intake is not sealed well across the front where it's leaking oil down the seam between the head and the block which makes it look likes it's the head gasket when it's really leaking oil from bottom of manifold. Might try and check to make sure the bolts are tight.