Why don't car companies release cars that look like classics but with modern features? Many people love classic cars (although the definition of "classic" might mean 60's-era cars to one person and 40's-era to another). There is a big market for them, and all kinds of classic car shows.

Why don't car companies ever take an older design, upgrade the under-the-hood features (e.g. engine, add a/c, power windows, etc.), and release it? I'm would think it would sell pretty well. I know I'd love to have a car like that.