With a 660-hp supercharged V-12 and a six-speed manual transmission, this Jaguar restomod embraces the dark side.

Never mind the 100-something-horsepower Miatas, Capris, and Alfa Spiders—we're talking heavy hitters here, cars like the Chevrolet Corvette convertible, the Porsche 968 cabriolet, and Nissan's new ...