THE images on the Flickr slide show serve up a comforting slice of mid-20th-century Americana: the local banker’s slinky ’56 Lincoln Premiere reflects the summer sun outside the hardware store on Main Street. A spit-shined Divco truck delivers fresh milk from the Borden dairy. On the town’s outskirts, where rents are low and hot-rodders use the county road as a dragstrip, a custom ’55 Ford gets a set of loud pipes at a one-bay speed shop.