Is it the internal one you are talking about or the column? My problem was on the column. I removed the steering wheel and carefully un screwed the turn signal apparatus and laid it over and very carefully “squared” off the worn edge where the shifter sat. It took some time and very small files to make the repair. I now ALWAYS pull forward on the shifter when taking out of park or putting it in. My 56 still only starts in neutral because I still don’t trust it. I never ever park without using the e-brake. I NEVER run the engine in my garage while the shifter is in park EVER… always neutral with the e brake..
One additional item. I replaced the stock complete rear end with an 8.8 with drum brakes. I had it built in a shop but I installed it. I would not move it out of the garage until the e-brake worked properly. I believe they all were considered “parking” brakes prior to automatic transmissions.