So we took our boat out today, and the freeze plug that was replaced popped off when I went for a high speed run. The boat filled up above the starter, and I barely made it back to land.
I know the starter may be short lived, but there was enough water in the boat that water was flying up the back of the motor (7.4 mpi) from the coupler/ drive. So tomorrow I am going to insist that the drive get pulled and the ujoints/ gimble bearing get looked at. The engine got hot enough to start smoking from the front somewhere.
I'm still not entirely sure that the block is not cracked, but so far it seems that it was just the casting plugs that popped off due to a winterization that did not appear to be complete for one reason or another. The oil btw, still looked fresh and new.