I would un-winterize engine and run the boat away from the dock. Do an oil change, run boat for 20min underway, shift a bunch of times, repeat. Change oil until fluid is crystal clear on stick. Then change a couple more times. You want all moisture out of there.
Any moisture in there is going to cause rust over layup period.
Those sucker bottles may quick work of draining. Once drained, briefly crank engine and shift FNR to blow what is in lines back to sump, then shut down and suck sump again. Then refill.
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