Ebay is an option as well. You won't sell it during the auction, but it's a cheap way to get mass market exposure. I've bought a couple of cars directly after the auctions ended.
As Bruce mentioned,
427 Cobra Country--Ford AC Cobra replica manufacturers SUPER-SITE gets a lot of specific Cobra traffic. There seem to be a lot of sales to Europe through that website, so that might open up your buyer pool a little bit as well.