Christopher,
If the block's been bored .030 over and is worn way past its wear limits, it is possible to resleeve it. That being said, it will cost you some bucks to do it, my best guess is at least in the $100 range, but I don't know for sure. When the time comes, I would take a long hard look at the block, the crank, valves and seats, and the rest of the internals before sinking a lot of money in it. Usable and rebuildable blocks are around, and can sometimes be picked up cheaply.