2004 F200 submerged briefly in fresh water

[rycsailor]

I purchased a boat that was briefly submerged in fresh water while tied to the dock. The motor was in the down position, turned off and about 1-2' below the surface. When the boat was raised the motor was immediately pickled and run for about 20 minutes. It was then winterized and stored this past winter. It only has 350 hrs on it and the maintenance records that came with it show it was very well cared for. What should I look at before using it offshore on Lake Ontario this summer? Should I replace the alternator and starter. The engine still looks brand new, but I know water inside some components can cause hidden issues.
I just joined this forum so thanks in advance for any assistance.
Thanks!