Coupler ID/spline count might be the same on your '71 Cuda but on my 65 Dart (64-66 A body's & maybe 63) I went from manual to power & got a shorter inner shaft & it swaps right in but I had to get the PS coupler, it was different. Luckily I had one in my stash & it sure was nice to keep the same col just swap the innards (One of the adv's of early A's ). The Camel pic was good, that's us