My '72 dart 440 still has the column shift automatic. It was an original 318 car. I just went to the scrap yard and pulled all the linkage from a mid 70's big block Cordoba and it all went right on the Dart like it was made that way!
And what did you use for kickdown linkage, Lokar? All the linkage from any small block and 727 equipped A-Body would have all the proper linkage except for the kickdown linkage would be a bit different. Of course if you are running a manual valve body then no issues.