Blackcat, I also have some original headers that are well pitted, but I'd love to fit them if possible.
I have a Keihan system in stainless atm but the cross over pipe is so close to the alternator cover, I can't remove it without taking the exhaust off first!!
What did you do to yours, blast and VHT or ceramic?
Any chance of a close up of your headers to see what they look like at the surface?