About the only thing you might have difficulty getting is a cab, and windshield and wraparound back window glass; and, the glass may be available as reproduction, now. Fenders, hood, bed parts and tailgates are available in both fiberglass and steel, as well as many patch panels for the cab corners, floors, step boxes, and rocker panels. Repro rubber parts are readily available, as well as a lot of other stuff. These are very popular body styles, so there is a tremendous market for parts, either for a classic restoration, or a resto-rod project. Check out the ads in Classic Trucks, and Custom Classic Truck magazines; also, CPP, Golden State, Brothers, and many others online. As far as power and drivetrain goes - well, "anything goes" .