Difference between pre-1966 and post 1970 steering columns

Hello, I am looking to change to a manual steering column on my 1966 Barracuda. And of course, these early A columns are getting hard to find.

I am curious is there a mounting bracket difference between the early A column and the 1970-76 column? I can get a Flaming River "no key" manual column for a good price. Anything else I should be worried about?