Coolant leak -hydro locked engine

similar situation.... two different alloys. It's my understanding cast is very difficult to weld properly. Looks like to me if you try and weld it, and it doesn't work (which odds seem to play more favorable in that direction)..... you got yourself a new wheel chock. Guess I'd figure the odds would be better to try and glue that sucker up and move on. Crappy situation to be in for sure. Might have been a good time to try some CRC stop leak.