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MSD has a tool card that comes with the rotors that has notches cut out for each type of cap they sell. I had been throwing them away and simply guessed at how far up to bend that tab. I found bending it up too much causes premature wear on the carbon button. So, when you get a new rotor, save that bright yellow/green card, it's handy. I can get the measurements off mine if you need it.
To answer your original question, I have found it normal to see carbon dust in the cap. Word to the wise, keep it cleaned out as this dust coupled with moisture(from condensation or rain) makes a pretty good carbon "glue". This will gum up everything from the cap down to the bushing where it mates to the block. Good luck!
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