IMHO, you never want chickens to drip on anything while they are cooking. So they will have to go beneath the brisket. No increase on wood, but typically people use a milder wood on fowl than they use on beef. Beef loves smoke, fowl loved MILD smoke. Typically for me in my 050 or 008, 3.5-4 hrs for whole chickens and about 3 times that long for the brisket, if I dont open the door.
bob