Hi Mike,
Welcome. When my dad had my moms '66 GT350H (6S547) re-painted he griped about having to buy powdered gold to mix into the gold paint. This was in the mid-1980s and while I was heavily involved in Mustangs with my dad and mom I don't recall why he decided he had to add powdered gold dust to the paint. It might have been our local SAAC rep how was extremely knowledgable regarding everything Shelby. Im sure the correct color answer will appear here soon. BTW: the gold stripes DID look amazing when the car was finished.