No they are NOT B-body headers. This is a entirely new product from TTI that JUST got released and shown to the public at Spring Fling a few weeks ago. What is pictured above is the FIRST set. I'm sure you will see product releases in the magazine soon.
The idea of these headers is to eliminate the costly need to have a set of custom headers for guys building clone Hemi A-bodies with modifications that were done on those cars originally (K-member spacers, cut steering column tube, offset master, etc, etc...)
But yes they look a lot like 62-65 Hemi B-body headers. But it is a whole separate unique jig and tooling for this new A-body Hemi headers.
These were fitted in a 68 A-body with 68 K-member, 68 centerlink, 68 manual steering box. The K-member was made from a S&S kit from Greg Fernald in AZ.
Here's pictures....