Header coatings, how necessary?

I have a set of Dougs plain steel headers that are new I plan to put on the 383 going in my Coronet. I called Jet Hot a while back and they said they would blast them inside and out, treat them inside and out, coat them inside and out and give them a lifetime warranty for 365. As I get closer, that's something I will get done. I think it's well worth it.