You need to contact Jim in Westminster, MD but he's currently on a ZR-1 road trip to the west coast (read about it
HERE) and won't be home until later this month. Jim hosts a maintenance day from time to time where a number of ZR-1 owners show up and work on their cars ... there's a lot of knowledge/experience in that group and it might be the best (i.e. closest) option for you unless you can make it to one of the shops that Kevin mentioned. You might want to send a PM Jim to let him know of your interest ... I think he tries to check the forums at least once daily when he's on the road.