Your crank can be saved the same way they do stroked cranks. Have a pro weld up some new metal on the torn up journal, then turn it to match the others. But it might be cheaper just to buy a new crank. In any case, you'll want to figure out why that one failed catastrophically. Maybe the oil feed hole in the crank blocked up at that location? In the meantime, if you decide to just put it back together to let folks test drive the 727, take that plug out so the piston is just sliding, not working against compression. I suppose you could also remove the pushrod from the intake valve on that cylinder too, so the dead cylinder is not getting any fumes to pump out into your engine compartment through the empty spark plug hole. This is a "crawl home" trick that can save you if you really, REALLY need to go a few more miles on a bad rod bearing.