Yes, the a-body case has a 3.7" BC. But that won't work with the Tilton bearing. The Tilton bearing threads onto their own retainer and has a tab where a bolt holds it from spinning. I'll attach a couple of pictures. They're a little blurry, but you'll get the idea. I need to get photos of the bearing, too. My friend had brought the Tilton bearing retainer to work to ship it back and I had to snap some quick photos before he shipped it.
Also, here's a page on BBD that's a good reference.