The Porsche 911 - Base Model - Custom market includes vehicles that were produced as standard or "base model" G-body 911 between 1974 and 1977 (US spec and ROW), and have since undergone significant exterior or mechanical modifications as compared to the original factory specs. This includes body and/or engine conversions, backdated vehicles, and tribute samples. It DOES NOT include vehicles that have undergone restoration, the addition of performance accessories, and/or increased displacement. Given the variety of vehicles in this markets, each one should be evaluated on a case by case basis.