J,
If you're serious about this car or any early original series Cobra I'd go ahead and spend the $75.00 usd to join the registry.
https://saac.wildapricot.org/page-258810
Because IF you're serious and going to drop $1.5-2.5 million on a car it would be prudent to go to the source of the information.
Forums can be very helpful but can be like asking Stock Market advise from fellow Subway passengers. Sometimes its great, sometimes a grain of salt.