check for the milkshake oil if its not nasty in there you might be alright with just slapping a head gasket on there. i would throw a coolant pressure checker on there and see if you start losing pressure. if you do you might have a cracked head. pull the valve cover off with the pressure checker on there and see what happens. more than likely your block is fine, but i have seen that head crack inbetween the #1 and #2 cylinders. hope all works out and hopefully its just the head gasket.