The first thing I would do is have the shop sonic test the block to check the wall thickness. If there is enough material available in the cylinder walls the imperfections might be able to be dealt with with a simple overbore. Pay particular attention to the thickness on the thrust side of the block. The thrust side is the side that the piston "pushes" against during the cycle.
Sleeving is not a new art, and if done properly, the sleeved cylinder will be the strongest one in the block. I am not a fan of sleeving all the bores on a given block. In most cases the structual integrity of the block will be compromised, and this will just lead to more problems. As far as all the particular idiosyncrasies of sleeving a 2.4 block go, well, I'm a newbee, so I couldn't tell ya.
The piston oiling feature of the block may need to be adressed if sleeves are added, but beyond that, I dunno. A GOOD machine shop should have a catalog of available sleeves listed by specifications like size and thickness, so if you chose this route there should be something available. A good manf. of sleeves is Darton Sleeves. Do a web search and you should come up w/ their website. Also make sure that the shop is experienced in the
sleeving procedure. Too many shops will tell ya "Sure, bring it in," but then use your block as a lab experiment.