Six Pack is right gn300. The older muscle cars (1971 and before) all had their own price class ( the second digit of the VIN). The separate price class on the Plymouths continued through 1974 and so did the Dodge Darts. But the Dodge Challenger and Chargers after 1971. The Rallye was an option package of the mid priced Challenger and Charger. That package included the 340 V8.