Need some purchasing advice

The value of that car; if you change colors etc, isn't going to mean a thing. It's already had parts swapped etc... cars that you don't want to screw with the "value" (if that's your thing) are the original special cars.

That car looks like a pretty good solid start.
BUT I would say this...that Barracuda will turn up one of these days, and you might have all your money wrapped up in the Scamp.