I think there are ton of car that are stock, most are garage queens, and most will almost never see the light of day, which is big shame. I think the modded cars are rarer, and special and unique(some can say one of kind). I have modded my car with Ford Racing products, but today I shipped out to Mr. Heffner for some Double T'S, I will be car #21 overall. I think thats pretty rare. But I also have all my original parts so I can back to stock if and when I choose. I never intend to sell the car; that will be up to my kids. So the money value doesn't matter to me, what matters to me is to enjoy the car. The investment/collectable issue is all BS/Fools gold. The made over 4000 of these, this isn't a Veryon or Enzo. These cars will always hold value, but if you want to make money go buy real estate or an Enzo etc. My 2 cents!
Mg