I have owned this car for 41 years. It started life as a 318 2 bbl, column shift, 904 car. No rear diff was in it when I bought it. I cloned it to a 340 S car with floor console 1970 340, 727 and a 3:55 SG 8 3/4. I enjoyed that set set up. I then did a 5.9L magnum swap with a 46RE trans. Then...