Best car my family ever had (until my grandmother died and left us hers) was a 1969 Impala Dad bought from Hertz in 1972. The cross-country moves and daily trips that car made over the next 10 years would be a ... rather boring book :)
My buddy had a ‘72 Impala convertible. Before it got ‘liquidated’ by some drunk while it was parked on a curve, it was a tank. We took out the OEM engine and dropped a 400 small block in it that already had a four barrel carb and headers. We got into some mischief in that thing. Even I miss that car.
I had a '65 Impala that I drove for a quarter-million miles. Later, I had a '72 Impala that didn't seem to have been as well-built. It had a design flaw in that the metal below the back window would rust out and water would leak into the trunk during rainstorms and trips to the car wash--a flaw that plagued GM cars at the time.