Many years ago, I built a 427 Cobra kit, and I agree that they take up huge amounts of time. Almost to the point where it seems like your job is your "free time". With over 500 bhp, it went like stink, but it attracted cops from miles around even when we were just out cruising, so we sold it. As the missus and I are both very fair-skinned and therefore good candidates for skin cancer, we generally avoid open cars.
However, two years ago we decided that we wanted an open car for cruising in the mountains and along the coast in the spring, so we bought a Morgan plus8 powered by, believe it or not, an LS7 engine (as found in the Z06 Corvette). It is even faster that the Cobra was and is invisible to the cops (unfortunately, the same is not true about their radar).