What exactly are you needing done? A complete rebuild, basic maint., trouble shooting, going racing? There are several members in the Charlotte area including one with a 9 second car and one with a hybrid 1st gen Firebird. I don't think there is a 'GN' shop in the Charlotte area but with all of the knowledge around we might be able to help you out. If not, we should be able to point you in the right direction. I do all of my own wrenching and this site and these guys and their information has been invaluable to me. I think several of them ship their machine work out of state but general mechanic work??? I think there is a shop near Greensboro that has done quite a few turbo Regals but I don't know the name. I'm sure some more guys will chime in soon that will be able to be more specific.
BTW. Welcome back to the site and what area of Charlotte are you in?