Since the car originally came with them, that's the way I would lean. However, you aren't going back to stock so you can do what ever you like. Personally, I think the billboards are over done. I've seen them on A and B bodies lately. I would probably wait awhile and see if you like it without. They can always be added later.
To be different, you could add the 71 pin striping in red. I quickly tried to find a pic but didn't come up with anything. It would be understated and you'd be the only one that would have it.