I have the same setup, the Thunderbird IRS.
I am also using the same rims, Vintage Wheels pin drive knock on's for that original look with a deep dish.
I didn't have the LSD rear to, so I went for the Torsen type instead of the clutch type or detroit style and beefed up axles. It's coming together nicely, and should have the same stance as Warrens one. It does look good, I haven't see the rears on mine as that has been an issue with the incorrect parts being delivered from Vintage Wheels from the get go.
http://www.torsen.com/products/T-2.htm
I am running 3.27 rear end with a 5 speed TKO600, so similar in many ways but slightly different. Should be good to see how they compare in the future.