Challenger R/T is the muscle Challenger — JS23 hardtop, JS27 convertible, JS29 hardtop with the SE luxury package layered on top. Standard engine was the 383 N-code Magnum four-barrel, with the U-code 440 Magnum, V-code 440 Six-Pack, and R-code 426 Hemi all on the option sheet. The R/T treatment brought the bumblebee tail stripes (or longitudinal C-stripe), the heavy-duty cooling, and the upgraded brakes that defined the Dodge performance line for 1970.
Designer — Carl Cameron led the Challenger's exterior design under Dodge studio chief William (Bill) Brownlie and corporate design VP Elwood Engel. Cameron's prior credits include the 1966 Dodge Charger; the 1970 Challenger's grille reportedly draws on a stillborn 1966 Charger turbine sketch he had developed earlier. The Challenger does not share exterior sheet metal with the Plymouth Barracuda despite the shared E-platform — its wheelbase is two inches longer, the body five inches longer, and every panel is unique to the Dodge.
T/A Challenger: 1970-only homologation sibling running the 340 Six-Barrel small-block with the AAR 'Cuda's induction logic, side-exit exhaust, fiberglass hood, and M0-prefix sequential. Same plant (Hamtramck) and same 1970-only window.
Period factory framing — the 1970 Dodge Challenger Catalog (printed August 1969) confirms Challenger R/T's standard equipment: 383 Magnum 4-bbl V8 standard, NASA-type hood scoops standard, full-synchro 3-speed manual standard with the optional Daytona-type 4-speed available, full gauges + tach + electric clock standard. The brochure describes the optional 440 Six-Pack induction in period prose: 'Three two-barrel carburetors, special intake, Daytona-type four-speed transmission, and Rallye Suspension, moulded around a race-ready 440 V-8. They lurk under an optional shaker-type fresh air scoop.' The 'Shaker' name is Dodge's; Plymouth's term for the same component is the 'I.Q.E.C.A.G. — Incredible Quivering Exposed Cold Air Grabber.'