I don't know much about that Boss but, I know a whole lot about the ORIGINAL "Silver Bullit" GTX owned by Jimmy Addison. It was a "driver" and was used everyday.
This car in the article is a remade car and NOT with the ORIGINAL underpinnings.
That car had 10 inch Cheater slicks of the day, (1968), and had two lines of tread to make them street legal. (Nothing like today's rubber).
That car also had only a 3.91/1 rear gear and FOUR mufflers and Jimmy used it as a parts chasing car in normal life for the service station where he worked on Square Lake Rd. & Woodward.
I can tell you first hand, (cause I was there), that car outran a legimate Pro Stock Camaro on the street in 1970 when that race car was forced to run with mufflers.
The automatic transmission in that car was the basis for the transmission used in the Original "Motown Missle", (Challenger), Pro/Stocker; (the first and only competitive Pro Stock car with an automatic transmission).
That GTX was NEVER run at the drag strip in those days using anything but, street legal trim and those times are "stop watch" guesses as Jimmy, (and the people who helped him at that time), never let the real times be known. He only went as fast as he had to go to win.
THAT original car was disassembled over 30 years ago and the remake became a reality 15 years ago. The car looks the same but, what is under the skin is far from the original.
The Boss probably shares the same kind of history.
The "Charger" in SoCal owned by "Big Willie" was in the same kind of mold..