I found Gibbs Rd in Moyock. You can see it on the Google map here: http://goo.gl/maps/uDS4B
I live about 25 minutes from there and if you could pinpoint a location on the map of where you think the plantation might have been I will go out and see if I can find it and the cemetery. If I find the cemetery I will photograph all of the stones and put them online for you to see.
You can email me privately at ncgeniehunter at yahoo dot com
Replace at with @ and dot with .
Hope this helps!