Bitter taste of defeat! So much coolant in the oil pan.

I agree with the timming cover leaking, especially if water is running out into the pan as you fill up the radiator. Did any of the water pump bolts get tight before they were all the way seated? You can break into a cylinder on some of those holes and you get water going into the cylinder and into the oil pan. It's usually toward the bottom so it not in he combustion area of the cylinder.