More info needed...
Early, late or really late motor? The really late motors have 4 extra head bolts, little ones, down by the spark plugs. The early motors have studs that tend to stick to the head.
Recent discussions on this subject - remove cam box to close valves, then stuff rope down a spark plug hole and rotate engine. Or thread a busted spark plug tool down there, fill cylinder with oil and use grease gun to pressurize.
Or, get the head removal tool.
Pete