If the sealing ring of the gasket doesn't touch the pitted spot, you will not have a problem. DO NOT USE JB WELD! It wouldn't work well anyway, and that spot is too close to the combustion chamber to be safe. Since your using a graphite gasket, it will be more tolerant of minor low spots than a MHG. I would recommend using Permatex Copper Spray a gasket on the HG, as this will improve sealing as well, and is OK to use with a graphite gasket. I'm using it to replace the damaged viton on my used HKS Stopper, And I've had excellent results using it in other instances.