It might be a good idea to pull the valve cover and soak the valve guides down with penetrating oil to keep from bending pushrods as you work with the crankshaft. Even if the crank and pistons free up, it's possible for sticky valves to make it hard to turn the engine.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!