Over forty years ago, still an apprentice at work, a bunch of us had our own section of the parking lot, with a sign that said "high performance autos only". My road runner, a Barracuda, Mach 1, a Cougar were always parked there. At the other end of the lot, more pedestrian vehicles.
One guy, another apprentice about my age, drove a 1964 Chevy. I don't remember if it was an SS or just an Impala or Bel Air but he saw us looking under our hoods and came over to chat. He said his car was fast too. He looked like an accountant with glasses, we asked what engine he had, and he said 409. We didn't believe him, went over to take a look. Sure enough, a 409, and on top of that it had the dual carters. I never saw him hit the gas, and he soon sold it. He said it used too much gas, got $1800 for it.