OD or Non OD 833 behind a slant 6?

I’m considering converting my 75 Valiant (225-auto) to a manual. I have both an OD and a non-OD transmission to choose from. The car currently has stock highway gearing but I don’t see it ever having anything lower than 3.23’s if I ever do change it. It’s just a driver. I’ve heard the slants don’t match up well to a 2.66 gearset due to shift points and where they fall within the power band of the 225’s. Looking for any input on how the 225’s perform when mated to either of these transmissions for street use.
Whoever told you that I was speaking from a standpoint of too little gear to begin with... like 2.76 or something.
Put a 3.55 or 3.91 behind it.