Classic American muscle cars are a rarity at the annual Specialty Equipment Market Association (SEMA) custom car and tradeshow in Las Vegas. But finding a classic Swedish hot rod at the show is about as rare as finding pickled herring the local burger joint. None-the-less, sitting among three highly customized Volvo C30s the 100,000+ SEMA attendees will find a 600-horsepower 1967 Volvo Amazon.