Put some 7/16-20 grade 8 bolts in the flywheel flange bolt holes to pry against and use a long pry bar or a piece of 1/4" X 1 1/2" flat bar about 3 feet long to turn the crankshaft. That engine will break free pretty easily. The chances of having a tight bearing are somewhere between slim and none. When you get each piston to the bottom of the stroke use a dingleberry hone lubricated with cheap motor oil to polish the rust away, then coat the cylinder walls with general purpose chassis grease to keep them from rusting again.

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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!