94 olds 88 Head

How can you tell the difference between a cracked head and a blown head gasket. The head is cast iron, not aluminum I think. When I fill the coolant, it just pours out on the ground. It did overheat when my water pump went out, so not sure if it's the block, head, or just the head gasket. How can you tell without tearing it apart?

If it is coming out between the head and the block it is usually the gasket either way it has to come apart.