Help converting my 64 to 66 23 Spline 8A33 to an overdrive ?

You will need a different Bell to use an A833od The bearing retainer is larger on OD 833s. I am currently removing my A833od from my 64 Dart, changing the bearing retainer so I don't have to change my bell. The reason I am going back to a regular A833 is I don't like the way the OD shifts the gears are too far apart and the synchros are not fast shift friendly.
Yeah 3.09 first gear, big rpm drop to second