Fusick Automotive has the red-orange air cleaner paint. Part number AF150S. Fusick is at (860)623-1589. Dupli-color makes a perfect aluminum color engine enamel paint, part number DE 1615. You should be able to get this at any of the big auto parts stores.
The J tube you are talking about is a road draft tube to evacuate crankcase vapors. The 1963 went to a PVC valve to recirculate the vapors back into the engine. Maybe you can place a want ad on this web site for the road draft tube. Not sure about the grommet, my old one was good enough to re-use.
If you really want to detail the engine, Jim Osborn reproductions makes decals for the air cleaner and the little rocket emblems on the valve covers.