I'm not sure exactly what the weight difference is between a SB and a BB but IMO the advantage would be the weight saving and the fact that its coming off the front end which is good. But to me, Big Blocks are just plain more fun mainly because of all the extra grunt and just plain brute force. Making something work while going against the grain is cool too. I'm building a Big Block Duster and not moving the rear springs or cutting anything. I've already got a few coments from my buddies who think I should move the springs in. Alot of people follow the path most travelled but its more fun to go against the grain.