Very stubron head gasket

Are you saying that the head is still stuck to the block or that the gasket alone is stuck? If the head is still stuck you can get more leverage by putting a pry-bar in one of the intake ports and prying. It works much better than trying to get a screwdriver between the head and block. It is best to leave a couple of head bolts in the block but loose so when it pops loose you won't flush you head on the floor or engine compartment.