How do I tell whether I cracked my head gasket or cracked the block?

What I have: *Semi-Blown* Supercharged D16Y7

What my general problem is: Oil mixing with coolant

What my bigger problem is: Oil clogging radiator, and the oil+coolant mix spewing from my radiator catch can when I floor it

I already have an aluminum radiator, but I don't want to install it yet until I fix my problem.

 

Simple answer? Spend 30 minutes draining your fluid and pulling your head. It's not difficult, and a head gasket isn't that much. You can actually use the Y8 gasket since it's open. It's metal and is only roughly $40 from the dealer.