Well, that's a nice bedtime story, especially the 500hp Pontiac bit, but i'm sorry to tell you, it's no "race version/engine". And probably neither was that GTO.
Sounds like my freeway race with a Getow with the old mans Polara station wagon.
The mighty Getow loaded down with high school kids was embarrassed that day, the old Polara was right at their door. lol
Every time I saw the kid in school he'd just turn away. I never could get him to race the Charger or Barracuda. lol