With todays 4 barrels, you can get more cfm with one carb than some of the old 3x2 setups had. I didn't like having to mess with the 3x2's all the time. They look neat and you can do it if you want to, just make sure you have real 3x2 carbs instead of just 3 old 2 barrels you picked up somewhere. The front and back carbs should not have idle air screws and should be able to shut off completely when not under a load. Also, they won't have chokes on them.