I worked at a local drag strip in the early 1970s and the fastest production vehicle I ever saw was the 1970 SS 454 Chevelle. With an automatic transmission a fully stock SS 454 would consistently run the quarter mile in 13 seconds. A fully stock 4 speed version SS 454 was capable of elapsed times in the mid 12 seconds.
Just out of curiosity, were those times on stock tires? As I recall, the stock rubber on a Chevelle SS wasn’t especially wide.
A friend’s son had a 454 Chevelle.I was driving a 440 Roadrunner at the time.We raced one time and I beat him by 4 car lengths.