I'm not 100% on the engine/trans combo. No, this cobra is brand new. Ran few weeks ago at trails. But it can legally run with challenger/copo/cobra jets now. it was a keep quiet build being it took nhra a year before they gave the ok on it. Pat at PK told me to not say anything about it til it was out. Car owners daughter didn't even know about the car. Otherwise I would have been like "check this out" haha. Car should clean up next year.