The first-generation Chevrolet Camaro appeared on September 26, 1966, for the 1967 model year on an all brand new rear-wheel drive GM F-body platform and would be available as a 2-door, 2+2 seat, coupe or convertible with a choice of six-cylinder and V8 powerplants. The first-gen Camaro would last up through the 1969 model year.
The RS was an appearance package that included hidden headlights, revised taillights with back-up lights under the rear bumper, RS badging, and exterior bright trim. It was available on any model.
The Z/28 performance package was designed (with further modifications) to compete in the SCCA Trans-Am series. It included a solid-lifter 302 V8, 4-speed transmission, power disc brakes, and two wide stripes down the hood and decklid.
Source: Wikipedia (original)