putting in 2 carbs is easy....
installing 2 manifolds and cables is hard...
you may get a 5-10% rise in HP with a 20-25% rise in fuel consumption....and the headache of syncing 2 carbs
if you want to get a little more umph from ur sloth....try re-jetting and make the timming a bit advanced...look out for overheating though...
..share your decesion and result...