As I read through the thread I was wondering if any one had had this experience. Some guys will angle mill heads to gain compression when you bolt up the intake the bottom of the gaskets will not seal (unless the manifold is milled to match) They will often not leak until after or during a heat cycle. after the leak is established it continues to leak even cold.
I hope you problem is at the timing cover. Also note that is very easy to put the water pump gasket on wrong, but that leak is to the outside not to the pan.
