In 1967, Mother Mopar widened the front frame and body to better accomodate the big block as well as a better exhaust on the small blocks.
The front track went from 55.9 inches to 57.4 while the rear track stayed at 55.6.
What you are seeing is the difference which makes you thing the car is dog tracking.
Follow it down the road and check the right side also.
Or just run a string line from front to back tires on both sides.
