If the engine was not properly 'pickled' when stored, I would expect some visible rust on the interior of the motor caused by the action of the moisture following the alcohol into the motor. I cringe when I see someone grab on 'old' motor.....grab the flywheel and start 'cranking-it-over' without first either doing the tear-down, inspect and lube before the attempt to fire the little animal. Like 'Spooky' said, you can bring it to life but what you get out of it is a result of the love you put into the effort. An OS motor already has 'quality' in its favor but 'IMPROPER STORAGE' can kill the best of hopes.
'Run it till it Stops' !!!!!!!!!!!!!!!