This story reinforces the unequivocal truth of the age-old gearhead adage that "There is no replacement for displacement"...
Also, they got this car down to 4300lbs before the addition of a fiberglass hood, bumper, etc... That means this car, in all it's hulking hugeness, is probably tipping the scales at @4000lbs or less now. Honestly, many of todays "muscle cars" don't weight too much less than this (V8 Camaro & Mustang GT both are @3700lbs dry, 2022 Corvette is @3400lbs dry) and the cow known as the Hellcat Challenger weights 4450lbs, well OVER what this car weighed even with the previous heavy steel body panels!
So, considering this larger than large vehicle, with 500 inches of forced induction glory under the hood making 2000HP, it's just a matter of getting the power to the asphalt to make it a REAL ego-buster for many modern drag strip dwellers.
In the early 80's when I was in HS, I had a '69 Ford LTD 4dr car (weighing in at 3825lbs) with a 390-4bbl engine under the hood. That car was equally huge to this Caddy. In fact, when we went to drive in movies, I could "seat" 4 regular sized teenagers in the trunk (yes, the trunk was deep enough that they could actually sit on their butts with the trunk lid closed). But, with the FE under the hood making @320 factory horsepower and 427ft-lbs of torque, my big land-vessel could beat the '82-'83 Mustang GT which was producing a whopping 158 HP off the assembly line.
Aaaah, the good old days when you could order a car with sometimes 4-5 choices of powertrains under the hood and when even big-a$$ luxury cars made enough power to easily get out into any level of traffic.