Chris,
You can definitely make a lean bulk out of eating low carbs. Just make sure you fill up all of the surplus calories needed with protein and fat.
I would avoid ketosis though. Keep carbs above 100g and throw in a few around your workouts. Ketosis is not a real good hormonal state for your body to be in when trying to add muscle. That said, fat calories can drive protein synthesis just like carbs although I'm not sure to what degree.
Search Lyle McDonald's message boards on bodyrecomposition.com for the low carb bulk. More info than you can imagine.
Hope this helps.
Tyler
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