The pcv valve hose has to go to manifold vacuum, so that's right. The hose to the rear of the valve cover is the inlet side of the pcv system, it lets air into the crankcase to make up for the air the pcv check valve allows to be sucked out. It routes to the air cleaner because you don't want unfiltered air going into the crankcase. If you put a small air filter on it and plug the nipple on the air cleaner, all is good, no oil into the air cleaner, clean air into the crankcase. The 2.6 used to have a jury rigged air pump to pump air into the exhaust. The pump was contrived by walling off the bottom of #3 cylinder and putting a checkvalve on the side of the block, and using the bottom of the piston as a pump, so the crankcase is not well ventilated and you get pressure pulses out the pcv intake hose sometimes, thus the oil in the air cleaner.

The 2.6 is a real dinosaur of a motor, going back to the early days of emissions controls, and it has some quirks as a result. It's been used as a propane forklift motor, a marine engine, and a turbocharged rocket motor in addition to passenger car and truck duty.