1969 AMC AMX, 390 V8, 4-Speed, believed to be a real âBig Bad Greenâ Car, Rust-Free, Former Low-12 Second Street Car. is a rare and compelling muscle car with strong pedigree and unmistakable presence. Believed to be a real âBig Bad Greenâ factory car one of approximately 200 produced it represents one of the most desirable and lowest-production color and performance packages AMC offered during the height of the muscle-car era.