Technically these aren't even Pontiac Firebirds. They're so old they're simply called #1 and #2, but they were the prototypes for one of the most legendary muscle cars of all time. And somehow they sat neglected in a Connecticut barn for years. 

"Fast N' Loud" host Richard Rawlings call the cars found for two upcoming episodes the "Holy Grail." He and his crew bought the two cars for $65,000 to restore. They flipped them for $650,000 after sinking $400,000 into restoration. 

“I wanted to sell them as they were … but somebody found out and word spread quickly before the cars even got back to Texas [where the show is based]," Rawlings said. "A guy wanted them fully restored to use as the centerpieces of a Pontiac museum in North Dakota, and he wanted them done in 60 days. A full restoration for a regular shop would take a year or year-and-a-half, but we finished both cars in 60 days."

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[via New York Post