Using JBWeld to Fix 10 Inch CRACKED Boat Block (Milky Oil)

This summer I went on a journey to fix my 4.3 Mercruiser (old style) that had a 10 inch crack in the block. The crack was on the INTERIOR water jacket, which motor heads online say is a death sentence. I had all the milky oil in the world, which spelled very bad news for the motor in the long run. Ultimately, I was racing against the clock as I had a week long family trip planned where we had a dock and house for 7 days on the most beautiful lake in the world. JB Weld to the rescue, or not?