OD or Non OD 833 behind a slant 6?

It's not going to matter OD or non OD you will drive easier with a lower gear.

When they came from the factory, manual cars always had a lower gear than the automatic counterparts. The torque convertor in an auto had a way to multiply the torque. So they could be used comfortably with a higher gear.

A manual is a direct drive so to be efficient it needs a lower gear. As I said in previous post, I have to rev it up pretty good to take off. They would have never made it like that from the factory because the take off rev defeats the gas saving mentality if the OD.

a non OD isn't going to fix that either, only a lower gear will.

As I also said, I don't think it's an ideal setup but I have it because I was working with what i had laying around the yard and it was supposed to be a driver for a summer and here I was almost 5 years later and still putting up with it.