Marvel is good, or just mix a little tranny fluid and diesel down the spark plug holes. High detergent and solvent to break loose the cylinders and make sure that they are lubed! And definitely check the valves, would hate to have one of those stuck the first time you try to turn it! If the motor does not turn by hand give the 'snake oil' a few days (even a week) to work its magic and do not try to force the engine to turn! You will end up with scored cylinders if you do.
Good Luck,
Gator
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