Photos courtesy Leake Auction Companies. Once every 10 years or so following Chevrolet’s introduction of the El Camino, somebody connected to the Pontiac division decided that it too needed a business-in-the-front-party-in-the-back sedan pickup in its lineup. As history in our universe has proven, a production-line Pontiac-badged El Camino never happened, but the 1968 LeMans Safari…