If the header tube is just barely touching the steering box and there are no sharp spots to wear thru the header tube I would just leave it alone.
My dad has an early nova and the steering link touches the headers at full lock. While it has left some small witness marks on the headers it's not enough to justify wrecking the ceramic coating by beating dents in them for that last 1/16" - 1/8" of space.
Do you have a spare tire and rubber trunk mat? If not that may help as well.
I might at this point, but we'll see. The side of the header contacts the round body of the steering box.
I need to measure/find a spare wheel for this car as I've got the big brakes up front. But it's in the works. No rubber mat either.
