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One last ditch lube the cylinders up good with sea foam or the engine tuner and aft fluid. Put plugs back in and set the crankcase and jugs up 16 to 18 inches from a electric hot plate on low to med heat let the engine warm for a hour or so till it gets good and warm/hot through and through. Set it back up and crank it then. The warmth will usually free up any sludge or gum and make the motor think it was just shut off 40 years ago.
It could free up the rings if it starts and runs once it is warm all way through.
Dale Walksler uses this process on 100 year old Harley’s. I realize outboards are two stroke and tend to dry out more. But it could work and soften everything up.