To add even further confusion to how the model lines were marketed by dodge & plymouth. The 72 Challenger rallye (JS in VIN) base engine was the 318 2 barrel even though it came with all the rallye parts (dash, scooped hood, sway bars etc). Interestingly the 340 was optional on the Challenger rallye which was supposed to be the high performance model. Then there's the base model Challenger (with JH VIN) that had the 6 cylinder or 318 as base engine. Whereas the 72 Cuda came standard with the 340 engine. This has always perplexed me on what the rational was behind how the high performance models were aligned.