87 Supra blown head gasket or cracked block?

I have recently purchased a 87 supra and a local shop did a pressure test on it and said it has a blown head gasket. I know the symptoms and it hasnt shown enough of these. My coolant recently blew out and seems to be coming from the water pump. and it was burning coolant before. The car ran very rich. These were about the only symptoms. No smoke or over heating. I'm wondering if this could possibly be something els like a cracked block? I would like to know and have a better idea before i pull the heads off.