I've also been told for a '70 that the outer shafts are different lengths for power and manual, with respect to the welded ends. here's a pic of mine, looks about 7.5" inches. I've always thought these were the same.

Looking at GTX's pic it seems there are different outer shafts for power and manual. His looks about 4" from weld to end of shaft for a power column, mine looks like 7.5" from weld to end of shaft.