Welcome Keith! What a find!!! Can you tell where the nails go in? Is it through a tongue? If through the surface, I'd be afraid that a planer or a sander is going to hit the heads, and if that happens, you know the next issue. If through the tongue, then I think I'd install it, then sand, just like you would do if you were refinishing a solid wood floor. Now, take this with a grain of salt...I've never been in this position to actually do it either way, so I have no real world experience to base my thoughts on other than what sounds right to me. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3