440 and 833OD
I am not sure they put an overdrive 833 behind any big block. you may need to get a scatter-shield bell for it.
like this.
Lakewood 15335: Blowproof Bellhousing 1959-1978 Chrysler 383/413/426/440 | JEGS
They didn't, but you can use an original bellhousing. You can buy a bearing retainer that has a 4.805" outer diameter that has the larger bolt pattern, so it can be used on the front of an 833OD
Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists
If you swap out for a 4.805" bearing retainer then you can use the later big block bellhousings that had a 4.8" input diameter. If you happen to have a big block bellhousing with the 4.35" input diameter, you can still use it by having it opened up for the larger diameter input. If you scroll down to the bottom of the page you can see the process here, they have a section on putting an 833OD behind a big block
Mopar Big-Block A-Body 4-Speed Conversion
As for the strength of the 833OD, I know a gentleman that ran one behind a 500+ hp 440 in a Challenger for a few seasons. He was running 29x11's and was doing 11.7 @118 mph with it, never had any issues with the transmission. He did scatter a few 8 3/4 cone style sure grips. The 833OD's get a bad rap.
There is an article about using steel bushes in an aluminum cased 833, the shafts were bushed during a rebuild to tighten things up. I don't doubt at this point that there are worn out aluminum cases running around. And I don't think that bushing the shafts during a rebuild would be a bad idea, if you're doing a full rebuild on an 833OD with the intent of putting it behind a big block it would be good insurance. But I also don't think that it's completely necessary if you have an 833OD that's in good repair, even if it has an aluminum case.
A-833 Aluminum Case Buildup - Mopar Muscle Magazine