The base 1970 Charger kept the same Richard Sias-styled fastback body the R/T trims wore — the 1968 reskin was a runaway design success and Dodge let it ride through 1970 with only minor grille and trim changes. The base car shared the 117-inch wheelbase B-body unibody and the same engine bay as the R/T (XS29) and Charger 500 trims.
Engine options on the base car: 318 2-bbl (G code), 383 2-bbl (H code), 383 4-bbl (L code), 383 4-bbl Magnum (N code), 440 4-bbl (U code). The 426 Hemi (R) and 440 Magnum (P) were R/T-only options. Built primarily at Hamtramck (B plant code).
Plenum decodes base Chargers using the same 1970 B-body broadcast schema as the R/T and Daytona variants — the body code in VIN positions 1–4 disambiguates trim. A base Charger that's been Daytona-cloned will still carry the base body code, and the schema's plant + option overlays flag the discrepancy.