707 Hell Cat, what does it mean?

One group knows cars. The other group does not. There are FEW exceptions.

Thankfully I'm one of those exceptions....... I wasn't alive during the muscle car hayday, I came in at the end. Learned everything I know from my childhood neighbor who was a grass roots mechanic and racer on the weekends. By the time I was old enough the muscle cars filled side yards, parts yards and could be had cheap and you could build and mod to your hearts content From junk yard parts. I was in Heaven........
I have also kept up with technology and work on any and everything with wheels. Still believe obd I & II readers are kind of like cheating. Anyone can read a code, it takes a person with skill to understand, diagnose and repair.
Computers and dyno's have their place for tuning though.