no, the fat thats already stored on your body will not contribute to muscle growth.
if you plan on gaining any more muscular weight, fat will come along with it.
thats why if you train for appearance reasons, and dont plan on dieting down with DNP or t3 and test or another strong drug, you should get to a bodyfat your comfortable with, then start to bulk so youre always a month or two away from that comfortable bodyfat. 10-12% is said to be a good number.