Wow, really cool that you found you're old Cuda but I know it's quite the bummer that it's so close, but yet so far since they won't sell it.
Is it a different owner than the guy you sold it to 11-12 years ago?
All you can do is strike up a relationship with the guy, talk some cars and let him know your intent and make some cash offers. Leave your number in his glovebox and just have him call you first if he ever decides to sell it.
If he doesn't want to sell it now, all you can do is wait and hope that you're first in line when he does decide to sell it.