Not a good idea, especially for the tubing. Boiling water will kill germs, but only after 5-10 minutes. There's no way you can keep water in a keg boiling long enough to sanitize it, and boiling water is an even worse idea for tubing. Break your keg down completely, soak all the parts in Starsan or iodophor and throw the tubing away. Then put a gallon of the Starsan into the cleaned keg and push it through the new tubing and faucet.