Depending on how much the heads have been cut,I would seriously consider welding since some of those look pretty deep and if there is material embedded in the head it might cause a hotspot and burn through if the temp gets too high.I would take them to a capable shop since you have them off and get a estimate on the repair.I'am thinking for a few hundered bucks you can have them welded and a .005 cut taken off and they would look as good as new.There is a water jacket behind that area.