Modifying or drilling holes or installing overhead ducts will de-value your Truck.
While this is true to some extent, not many of us can afford a concours level restoration. Often these old trucks have undergone previous modifcations so they are filled with numerous holes and other modifications. So while it's helpful to always keep Kens advice in mind, I try to keep another "professional restorers" advice which was to not worry much about modifications, but if you do them, keep the junk in the trunk. JMHO
