I have a 1966 Plymouth Satellite that my grandparents bought new. It's a factory 383 4 barrel 4 speed car. My grandpa was 45 and apparently in the midst of a midlife crisis or something when he bought it. I think he was a bit naive about it's performance and found himself somewhat fearful of it because when I bought it from him in 2000 it only had 27,602 original miles on it.
He always said it was the clutch and his WW2 leg wounds that made him drive a different car all those years. He said he never sold it because it was the only brand new car he had ever bought until he retired. But I think the truth is he got spooked by it at some point and just stopped driving it . It has a little over 50k original miles on it now and it really is a very quick car.
Not by today's performance standards but for it's era . I have drag raced it at a track and ran a 12.24 1/4 mile @ 108 mph with street radials . I have done a few modern updates like ignition and a x pipe exhaust but it still stock other than that. Fun car