For years, collectors traded rumors about an untouched, low-mileage 1970 Chevelle SS 454 LS6 without ever confirming it was real. My Car Story host Lou Costabile tracks down the car — all-original, with just 4,305 miles and even its factory tires still on it — and the chain of connections that finally brought it to owner David Beem. Commenters are calling it a genuine Holy Grail of muscle car survivors. Watch the moment its LS6 fires up for the first time in years.