I may be wrong, but that 455 emblem looks to be in a very weird location under the side gills.
The 71 Lemans 455 isn't that desirable or collectible. The Lemans Sport is a nice car, ragtop even better, but unless it has the 455HO, there's not much of a market for those right now.
Do not know about the emblems but here is a closeup, I do not know about the value either but if there is only 50 made there should be an interst in it sooner or later, I look at this car as a real sleeper, it will be fun to see how it runs :-)