SS Dana Axle?

From what I've seen & recall from several articles the Barracudas were not modified from Hurst. Now grant it, the "mule car", S&M, and several others may suggest they were but keep in mind these weren't "complete" cars when shipped & Mopar themselves told the buyers so. And a friend that worked at the Hurst factory mentioned this while helping me with my Dart---which we all know were DEFINITELY cut. It stands to reason that between multiple runs of these cars, rules, individual owner's skills and just progression of the class the owners would trim them as necessary.