I was going to recommend using the old crank the over the engine with a breaker bar attached also.If you dont mind buying a pump or front crank oil seal. heat the bolt up just a touch with an acetylene torch to loosen it up. If not make sure the engine can not turn over and use a 3/4 inch or 19mm drive breaker bar and a really long pipe.
But seriously a little heat can't do anything but help the situation. Notice i said a little.