Pin hole in cast iron head

So far the jack nut + Belzona has survived the FT cam break in and 3 short drives. Total run time close to an hour I suppose. No indication of any water leaks yet. My daughter is getting married this Saturday and wants me to drive her to the aisle (outdoor wedding) in the old truck. I'm praying the head can survive long enough for that. After Saturday a leak won't matter as much.