Tatra 700 Ecorra Sport. A modified Tatra 700 built by Ecorra for Tatra in order to get the Czech land speed record (320 km/h).
Later Tatra 603 Team bought the car and modified it for touring car racing. Oh if you were wondering, yes it’s still powered by air cooled Tatra V8.
Some more photos and specs in this Retro Rides thread.