The Challenger was described in a book about 1960s American cars as Dodge's "answer to the Mustang and Camaro." Introduced in fall 1969 for the 1970 model year, it was one of two Chrysler E-body cars, the other being the slightly smaller Plymouth Barracuda. The 1970 Challenger was a rather late response to the ponycar wave the Ford Mustang had started with its introduction in April 1964.
The Challenger was available as a two-door in either a hardtop coupe or a convertible body design, and in two models for its introductory year. The base model was the "Challenger" with either a I6 or V8 engine, as well as a "Challenger R/T" that included a 383 cu in (6.28 L) V8. The Special Edition or "Challenger SE" that added a number of appearance, convenience, and comfort items was "available as a model in either the Challenger R/T or Challenger." The standard engine on the base model was the 225 cu in (3.7 L) six-cylinder. The standard engine on the V8 was the 230 bhp (171.5 kW) 318 cu in (5.2 L) V8 with a 2-barrel carburetor. For 1970, the optional engines included the 340 and 383 cu in (5.6 and 6.3 L), as well as the 440 and 426 cu in (7.2 and 7.0 L) V8s, all with a standard 3-speed manual transmission, except for the 290 bhp (216.3 kW) 383 CID engine, which was available only with the TorqueFlite automatic transmission. A 4-speed manual was optional on all engines except the 225 CID I6 and the 2-barrel 383 CID V8.
Source: Wikipedia (original)