Depends on what you are smoking with ... I use my propane modified ECB at 300Âº to 325Âº until the internal temp reaches 170Âº or slow smoked at 250Âº for about 5 hours.
Hope that is useful to you ... good luck and send pix if you can.
I use a charcoal fired Weber Kettle for small smokes. The chickens are normally 3.5-4.0 lbers each. At 225 -250 degrees, usually takes 2 3/4 - 3.0 hrs. I was using a probe thermometer, but now, its all time and they always come out around 165 -170 degrees after I "plug'em". Remember, they will still cook a bit after you take them out of the smoker.