Just dump a tube of Alumi Seal in it and run it, don't go with a too high pressure radiator cap.
I had the same problem with my FE when it was new..small leak coming from behind the bell housing. It stopped when I put Alumi Seal in it and #12 cap....over 8000 miles on it...no problems with water leaking now. leaks no
oil, uses no
oil and no
oil in the crankcase.
Bill ps, I carry a tube of Alummi Seal in my trunk for field emergencies.