Rear-end weight difference

Most people dont swap in an 8 3/4 because it is stronger they do it because of the ease of swapping gears. I run 3.23's on the street and 3.91's on the strip and can swap them out in under 40 minutes with the help of my 11 year old son. Plus I got a screaming good deal on my 8 3/4, If you had the chance to pick up a complete drum to drum 8 3/4 w/ 3.23's and a sure grip for $250 wouldn't you jump on it?
Charlie S is running a 7 1/4 with 3.91's and a sure grip, his 66 Barracuda with 170cid /6 on nitrus puts out 204 rear wheel HP and 355 foot pounds of torque. Your avarage 7 1/4 would blow appart on the first launch with that kind of power, his sure grip is where all of the strength comes from in his situation.