[Bored&Stroked]

I would first clean that area with a die grinder and sandpaper roll and try to determine how much material there is to work with. I use a sonic tester with a probe that is designed to go into ports. Without knowing this, might bore into that area and find you've got nothing to push the sleeve into. If the block was otherwise good, I might see if there is a furnace block welder in the area (which are getting hard to find). Or, somebody like lockn' stitch could pin it.