I popped off my valve covers and my rocker arms and pushrods are spotless, I have a little bit of hard carbon or residue inside the cylinder heads on the surface, it is now starting to loosen up, I can scrape it with a screw driver. I am just wondering if over time will MMO that is already in the engine loosen this stuff up more and then it will be dissolved and carried away by the engine oil. The engine is running fantastic since I added MMO 2000 miles ago.

Continue to use Marvel Mystery Oil in your crankcase at every oil change.  Over time, it will dissolve the remaining carbon deposits and keep them in suspension until you change the oil.  Once all the deposits are removed, the Marvel Mystery Oil will continue to keep the engine deposit free.

I went ahead and changed my oil yesterday that had 1 quart of Marvel Mystery Oil in there, it came out very dark, this proves that MMO is desolving the carbon deposits. I also noticed that when I went to add the new oil into the engine that I could here it pouring down into the oil pan. I also added another quart of MMO to the new oil.