In 1991, I bought an '87 Monte Carlo with a 305 in it, with 144,000 miles.
The guy bought it new, put it on a 4 year loan, and sold it to me when he paid it off. He had to travel a lot for his job and it was nearly all highway miles.
He ordered it exactly the way he wanted it. Cruise, tilt, air, and a power seat. That was it. Didn't even have power windows or power locks. He had a shop put a transmission cooler on it as well.
Even with 144,000 miles, it looked and ran like new. I took it up to 252,000 miles. I saw it around town for about two years after I sold it, and then it disappeared.