You should be fine if you drain all the water out of it(open the drain petcocks on the block) shoot a little grease in all of your grease zerks and put an appropriate of Sta-Bil in the fuel tank/tanks and if you wanted to you could fog the motor with a little top end lube or Marvel Mystery oil. Then put it in the garage and sleep well dreaming about next spring. If you live in a higher humidity climate or salty air you might also want to spray things down with some light oil or WD-40.