Me to. I though mechanical issues weren't covered as well.
Oops, I might have overlooked something; you are probably right.
Different tack: you have to consider the value of the car as-is, the cost of an engine rebuild and then the value of the car with its new motor. That's the economics side of things.
Then you have to consider the car's use. Is it occasional or every-day transport? If the former, then time and convenience are not crucial. If the latter, well, that's a different matter.
Other factors: are you mechanically able? Could you get the engine out, strip it, rebuild it and put it back in?
I am trying to be helpful because I can appreciate that life probably doesn't feel too good at the moment and you could do with a bit of encouragement.
Incidentally, I am intrigued by the cause of failure. Was it a liner fracturing or was it something else that broke first that then set off several consequences?
I have seen rods through the side of blocks and the damaged block was repaired. Similarly, I have seen destroyed combustion chambers from broken valves welded up and then remachined for valve seat inserts and the like to the original manufacturer's dimensions.
Most things are possible; it's the cost-benefit analysis that is decisive.