The one-off 1964 Pontiac Banshee sports car principle is once again to buy, this time in a listing at Hemmings. The asking rate is an awesome $1.2 million. The Banshee was an early attempt by General Motors to respond to the Ford Mustang. Recognized inside as the XP-833, it was the creation of John Z. DeLorean, who was head of Pontiac at the time. Extra …