I spoke with Ross on the phone this morning, as well as linking him to the post.
He said this is the first time he has heard if this issue on the 67-76 A body kit.
He has heard of this on 67-68 Mustangs. On auto cars the park brake assembly is mounted slightly closer to column, vs manual cars. Ross indicated there are in fact 3 holes under the dash on the Mustangs, the bracket only uses 2 of the holes. Auto cars use holes closest to column, manual use the more left holes, sharing the center hole. Why they did this, who knows? Perhaps a similar scenario on our Mopars?