smoky new engine

I just got the new 360 in the Dart yesterday let it run for a few mins and everything seemed fine but when i went to give it a lil gas it blew out a cloud of light blue and black smoke. I know the carb is a lil rich and i haven't started the engine all day because i haven't had time to tune it but the light blue smoke is oil right is this a problem or will it clear once i get a lil run time in