a-body rear end help

I'm not sure what kind of project your building but another idea, I'm building just a driver for street and strip. Not really a show car. I'm gonna run a 9" ford. Just because its harder for me to get 8 3/4 parts at an affordable price. I'm not sure what the width is but I have access to a lot of 9"fords. Surely I can match one up and just change or modify spring mounts. It's the same bolt pattern as Mopar big bolt. And I will still be able to change 3rd members easily for street and strip.