Just got an a833od from 1977 for a 65 barracuda
You can use pedals out of a 67-72 A-Body in the early A's they just hang down over the column differently but other than that they will bolt in and work if you are not after a stock appearance.
One of my Barracudas had a set in it. I pulled them out before I sold it and used them in my 68 Dart.
Night-Rider. you may have a slight issue with your Z bar, some OD bell housings are bigger than the 64-65 bell housing so you may need to trim a little off the Z bar to make it work depending on what OD bell housing you have.
Another issue with using a later bell housing in an early A is you may also have to use a couple spacers between your motor mounts to raise the engine 1/2" the Starter is not at the same height and can drag the top of the tie rods. This is not the case with everyone so you may be fine but I have had this problem with a few of the early A's I had.