You're going to need both. Alot of the wear items are going to be replaced as new. Such as suspension pieces, all of the rubber seals and gaskets, brakes and so on. On the '60 through '66 trucks, alot of body parts aren't yet being reproduced, so you'll need to find a source for used parts. I know I would give anything for reproduction fleetside boxsides, but no one is making them yet. As trucks become more popular, more parts will be produced, I hope,
Scott