Not firing correctly

I have a problem with #1 and #3 not firing correctly. To hear the car run you really cant tell and there is no backfiring or bogging down. Its a 360 with stock everything except cam and Mildon gear drive. I did install a Comp 268H cam. The gear drive was installed by the previous owner. It has new plugs, wires and cap. All the other plugs are nice and golden brown, but #1 and #3 are BLACK? Any suggestions.
Author: admin