In other words, late A-body...
Or, if you like, you could get one of the Australian axles. There's the Chrysler Centura, but it needs a lot of brackets cut off it (coil spring rear), or the 1970 and up Australian Valiant range. They have a host of ratios, they're made by Borg-Warner... 3.23, 2.92, 3.89. And if you swap in gears out of a Commodore you can have a 3.45, or out of a Nissan Skyline there's the 3.7 or another 3.89.
We have a wealth of that stuff here.
