Dream cars of the head, not just the heart

My Dad always had a thing for big cars. He fancied owning a proper American shooting brake, something like a 1968 Chevrolet Impala Station Wagon, With the right (ie, the biggest) V8 motor and automatic transmission the Impala could, in careful hands, squeeze a shade under 20 miles out of a gallon of petrol. And it was big. I mean BIG: 18 feet long and a fraction less than seven feet wide.