Carolina's? Thunderbolt - Good chance from Holman Moody Engineering, located in Charlotte NC.
http://www.holmanmoody.com/
"Holman Moody was for years the official racing contractor for Ford. We prepared GT Mark IIs, A/FX Mustangs, Shelby Cobras, Falcons, and Stock Cars. We raced in NASCAR, sports car racing, drag racing, rallys, and ocean boat racing.
Holman Moody had the best drivers in the world; men like: Fred Lorenzen, Mark Donohue, Bobby Allison, Ronnie Bucknum, Parnelli Jones, Ned Jarrett, Walt Hansgen, Peter Revson, David Pearson, Nelson Stacy, Al Unser, Joe Weatherly, Cale Yarborough, Dan Gurney, A. J. Foyt, Bo Ljungfeldt, Mario Andretti, Jim Clark, Junior Johnson, Dick Hutcherson, Augie Pabst, Richard Petty, Fireball Roberts, Curtis Turner, and Bobby Unser.
This web site will tell you about the history of Holman Moody, the people who made Holman Moody great, the products you can buy from Holman Moody and Holman Automotive. You will also find information about the new GT Mark II LeMans race cars being built today in the Holman Moody Race shop."