Richard Petty took a lot back at his legendary NASCAR career and revealed the era that stood out the most. When he appeared on the Dale Jr. Download podcast last month, Petty said driving in the early to mid-1970s is his favorite time. “We won a bunch of races with the Charger,” Petty said. “We had a lot of experience with it and we got to run it like four or five years. Of all the race cars I’ve ever had, it was the most natural race car that was before all the wind tunnel testing and all this kind of stuff. “That car was so sensitive, you could change a spoiler a quarter-inch and go from dea…