Hello, I thought 1966 GT Mustangs had to be a A code or a K code. Is it possible that a C code got a GT package from the factory? The car is a 66 convertible with a C code in the 5th digit. It appears to have all the GT equipment including a 4V intake and carb. There is no serial number on the block and no engine ID tag. The owner bought the car this way 9 years ago and was told it was a GT and he always thought it was. I looked at the car and noticed the C and now we both are confused. Any info would be great, thanks in advance, Tom.