You may find this story quite Interesting to say the least, and take it for what it's worth:
I recently drove to matteson(Chicago area) Illinois to purchase a 2007 Ram 2500 4wd with a buyer blade from an 80 year old retired Police officer, with 51 years of service with various city departments from 1967 or so,Including chief.. he was able to name every single police car type through all those years that he either patrolled with, or arranged to purchase for the respective departments through all those years. He also pushed snow as a business, which is why he had the Ram. But, he moved up to a 2014 warlock, and retired the 2007.
Anyway, he was fondly remembering the 69 Polara 440 HP cars, and confirmed they would exceed 140MPH.
But the funniest story he told was in 1967 the department ordered five Coronet police cars.
two 318 cars, two 383 HP cars, and believe it or not, they opened the hood on number 5, and it was a 426 Hemi. Back then, there was no harrah for owning one, as you could order a new coronet with one. So the city accountant called Chrysler and said they didn't order that, plus the extra cost was not properly budgeted.
Chrysler said they did order it, and too late, they won't take it back. They went round and round, to no avail.
so they used the Hemi coronet on the street for several years until the 69 440 Polara's showed up. The coronet then went to auction, and disappeared.
He added the guys always fought over who would drive it, and it went through tires look you wouldn't believe.
He is a very well known ex cop in the area, and very credible. Plus he was in 82nd airborne in Vietnam 65-66, and was wounded. So The odds of it occuring I believe is very likely. Very funny guy for an old Duffer!