Well, not 1966, but in 1967 I bought a Camero Rallye Sport from the first owner for $2300 at 4600 miles.
327 / 350 HP, 4 speed, A/C, PosiTraction, Daytona Blue with the flip down rear seat option.
Only thing I changed was to get rid of the dummy spoke hub caps and replace with alloy wheels.
I kept it until 1974, and sold it at 156,000 miles for $3500.
The guy that bought it drove off a river bridge the next week in what was ruled a suicide.

Today, that particular car would go $55k + at auction.