Sooty Spark Plugs ????

[IndyA]

Just did a 1,000 mile compression check on my rebuilt engine... all cylinders were 70#....Which I believe is "good"... the spark plugs hall had a thin film of carbon on them, though the very tip of the electrode had grey-white ash (Hopefully my photos get attached?) .... does this sound normal... if not can you make suggestions.

The spark plug gap was .027, I typically drive with the GAV valve turned to the left about a quarter turn and of course the advance lever down to the floor...

Thanks for your collective expertise....