The only true way to determine foreign market would be to enlist a professional classic car consignor with excellent marketing skills for a percentage of selling price. Typical is 3% to 8% depending on consignor.
Stay away from consignors who deal with late model foreign exotics or pre 1960 European as they command much higher seller premium.
You will be hard pressed to find a buyer with disposable income on eBay or Craigslist with the well optioned and documented Firebird you have. Sellers with a Ram Air Judge/GTO or a Ram Air Firebird/Trans Am have a difficult time in those online arenas.
You have done an excellent job initially describing the strong points, options, rarity (strong documentation/survivor). I would hone in on that with detailed pics of casting numbers, dates, carb number, undercarriage etc.
Collectors and enthusiasts alike will spend more for a complete and correct car. It's throwing that complete and correct in someone's face so to speak and knowing a buyer would be hard pressed to find a similar car in that condition.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
