[6pack] Carbon on top of pistons - engine experts please help!

[apackard68 at comcast.net]

I had engine run-on issues prior to my restoration project, so while the engine was on the stand, I pulled the head to look for carbon deposits on top of the pistons.  I found significant deposits on five of the six.  I used to run an external oil feed but stopped after going through oil at a fast rate (ring problem?).  When I removed the oil feed, oil consumption was greatly reduced but my run on problem was present.  What remedy do I have available to a) clean the pistons and b) prevent the problem from happening again.  I'm assuming that if my engine is put together and broken in correctly, the external oil feed should not contribute to additional oil consumption.  BTW, the engine was rebuilt in late 2005 with new pistons, rings, bearings, etc for .030 over bore. 
Thanks in advance for advice you can share.
Andy


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