In “Boss of the Barn: Restoring a Barn-Find Boss 429, Part 2: Undercarriage Restoration,” a 1969 Boss 429 emerges from its 40-year slumber in North Dakota, like a Rip Van Winkle of muscle cars, only less beard and more rust. Muscle Car Restorations in Chippewa Falls, Wisconsin, takes on the challenge, diving into the undercarriage with the enthusiasm of archaeologists at a new dig site. Who knew unearthing a classic was akin to discovering a new tomb—minus the curses, plus a lot more grease?