66 mustang cold start blows a little carbon.

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How many miles on rebuild?
Exhaust pipes new or old?
Parked inside or out?

Florida does have high humidity and all.
sorry lots of questions
 
does it use much oil?
I'm guessing that the old pipes have carbon from old engine?
Humidity going through engine is cleaning old carbon out of pipes?
I don't know. How much stuff on floor are we talking?