Porsche launched its first V-8 45 years ago, and since it’s Valentine’s Day, the automaker decided to celebrate with a love letter. The original Porsche V-8 debuted at the 1977 Geneva motor show in the 928, Porsche’s first attempt at a more luxurious, upmarket model. The 90-degree engine displaced 4.5 liters and developed about 220 hp in its…