Duster 340 is the muscle Duster — Plymouth's 1970 A-body fastback fitted with the 340 four-barrel small-block as standard equipment. Distinguishing kit: matte-black performance hood with twin functional scoops (or hood paint for the budget version), Rallye instrument cluster, heavy-duty suspension, Duster 340 graphics on the bodysides, optional Tuff steering wheel.
1970 was the strongest Duster 340 year by volume (~24,800 cars) — insurance surcharges hadn't yet pulled high-perf small-blocks off the street the way they would by 1972. The 340 four-barrel produced 275 horsepower gross.
Dodge didn't field an equivalent in 1970 — the Demon 340 launched a year later for 1971. So 1970 Duster 340s were the Chrysler corporation's only A-body muscle entry that year.