If the car has a rust hole in the oil pan,the entire engine is JUNK.That shows the car has sat for a LONG time out in the weather and that will destroy every part of the car.Condensation will eventually ruin seats,carpet,electronics,and even the headliner.It might have even been under water.Call a junk yard and ask them what junk price is and offer them somewhere around that.Or call the salvage people and see what you could get an engine for and leave the car alone.The engine will be a lot easier to store than a parts car.