Nothing to update except that I found some part numbers I thought I should share. I'd planned to run 3" dumped exhaust for a bit, something temporary. But tailpipes have always been in the plan. After a bunch of searching I finally found some 3" mandrel bent tail pipes for a square Blazer. They won't show up on Summit without the part number, but here they are.
http://www.summitracing.com/parts/imo-370120
http://www.summitracing.com/parts/imo-370127
After months of searching I found them on a Bronco forum. No matter, glad to know they are available and I felt compelled to share. Hope these help someone.