I could be way out of line here, but i honestly believe if you have never broken a 4 bolt, or even a 3 bolt rear end, then odds are you have NO business trying to put some monster domestic drag only rear end into the car. If you're breaking 4 bolt rear ends, you're well on your way to sub 10 second passes, or doing something wrong. Before you even THINK about needing to install a big rear end like that, you're going to have to have a full cage, scattershield, and a laundry list of other regulation mandated parts.