If you're getting excessive amounts of oil coming out of those holes, it's due to blow-by. It probably means it's time for a rebuild. I had the same problem, and after rebuilding it, it is completely fixed. The front hole closest to the oil fill hole is for the PCV valve. It has a tube that goes to the charcoal vacuum canister. The rear hole is the crank pressure relase hole, or whatever you want to call it. If a bunch of oil is coming out of this, you can put what is called an oil separator filter on it. It'll catch most of the oil coming out and let it fall back into the engine. This hole should lead to your air filter housing, where the noxious gasses are sucked back into the engine and re-burned until they are the right mixture to be spat out the exhaust. If your Jeep is running shitty, it probably because there's a ton of oil going back into your engine from this hole.
J. J.