The F-85 made its debut in 1961. The first generation was sold until 1963. They were sold as a coupe, sedan, hardtop, and convertible. The engine was a 155 horsepower V8, and it could be paired with a 3 speed Roto Hydramatic or 3 speed manual transmission. It was well constructed, but the handling and suspension were not made well for adventurous driving.
The F-85 had some major changes in 1964. It was made a body on frame car instead of a unibody. A V6 was offered for the first time, along with 3 different V8 engines. The only transmission was a 2 speed automatic, a disappointment to many driving enthusiasts.
Sales of the F-85 increased greatly after the changes made to the second generation.
The major change in 1968 was the restyling in the F-85, which was the base model of the Cutlass. The V6 engine was gone in favor of bigger V8 engines as the car tried to compete with others during the muscle car era.
These cars would get smaller as the muscle car age died down. The F-85 name would eventually be retired from the Cutlass trim levels.
The F-85 is slowly becoming a classic car among collectors. You will probably have to go to a place that sells classic cars to find one. The easier route is searching the listings on eBay. There are several listings for F-85's the last time I checked, and also some very rare parts.