There are 17 bolts holding a small block Chevy head. If you take out all the bolts and the head won't come loose, it's likely the gasket sealer has it glued in place. If you can get a rigid putty knife or some other thin blade between the head and block at one of the upper corners, you should be able to break it loose. Be sure you have ahold of it or it may slide off once you break it loose from its locator pins. If it lands on your toes you won't be walking normally for a while...