What PARTS did Hurst and Chrysler put in the Super Stock Barracuda & Dart not in other factory cars

Again just based on what I was told...so take it for what it worth...the person I purchased an original magnesium manifold from which was purported to be from a LO23 car....had a Dana which was again supposedly from that same LO23 that I also purchased...it was a B body Dana. And measurements of this axle are the same as a M code A12 RR. I do not say this proves or disproves anything just a contribution to this on going conversation. Just an observation. Nothing more.