I am preparing to build a model of Butch Hartman's '69 Dodge Charger 500, specifically making his 1971 car. One of the reference photos I have for the car is taken on the dirt, but I'm not sure which year it comes from. I've seen it posted on various sites without any credits or any info on the year and track. The image is attached below. If this is from '71 it will help me a lot. Initially I thought the track may be Knoxville, but the walls don't match with another pic of the race that I found from that year.