I have a 1966 mustang, and I am looking to replace a few things on it. I need to figure out my engine size. I know that the numbers from the head and on the block will tell you the year but not much more than that. I know C stands for 1960, and the next number stands for the exact year. My problem is that in one place it says C8 which would mean 1968, but in the other place it says C9 which would mean 1969. These years came with different types of engines. Anyone got any ideas of the size or what type of engine this is??