replacing my other, blurry photo. Plymouth's "super low priced supercar". It was just that. Introduced as a package on the Valiant for 1970, the base model Duster cost about $2100, and upgrading to the 340 was about $400. With the little Valiant frame and the respectable output of the 340, you could give bigger, more expensive cars a run for their money. my uncle had one exactly like this.