Ya know - decals, correct trim pieces, properly placed primer over-spray, years of crusty receipts and pedigree, and the correct number of casting tits on the tires don't mean nuthin' unless you're going to compete at the Concours d'Elegance level, or roll your car through one of the high-end auctions SPEED Channel televises. And even then, the '71-'73s aren't as 'valuable' to potential buyers as all of the 'everybody else has one' '64.5-'69s, so it's all subjective anyway.
I love what xoliex is doing with his car (SF '49ers colors), and while it would probably drop the value when it comes time to sell it (at a higher level venue), he's doing what he wants and will enjoy the car just that much more. He'll probably never sell it anyway, since it's truly going to be his car when it's done.
My Mach 1 is numbers-matching with less than 90,000 miles... but who cares? It's a pile right now - worthless, even - until it's shiny and running right. And when that time comes, it won't be anything like what I mentioned above. All I know is that when I tell everybody what my car is all about, they're thinking it's very cool and will only be that much cooler when it's running.
Hey - at least we're not talking about Mustang II's, right?
But if you're going to wear the Boss 351 decals, make sure they get put back in the proper location after the repaint. I think yours might be stuck-on a little high.