If I were in the market, I'd be all over this one. This looks like a great deal. The hubs sometimes get gummed up and don't lock as they should. Most of the time, taking them apart, cleaning and lube them is all it takes. If they are toast, aftermarket hubs are not too expensive.
If the valve cover is not the oil problem, it could also be the timing cover seal. Those tend to leak on the 8V, and it is not a big deal.