833 OD behind a 340?

It will work but the draw back of the aluminum case OD vs the Cast Iron cased OD...

is that in higher horsepower applications the wear due to flexing concerns to do with component in aluminim case...

a recall was actually done on some of the aluminum cased ones and they were replaced at the dealers with cast iron OD versions when they failed...

For the A body lines the aluminum case OD's were typically found behind the slantsixes in the Special MPG package cars because the extra weight savings that the aluminum case resulted in...

the Special MPG models were called "Dart Lite", "Valiant Lite", & "Feather Duster" these were 1 year only 1976 models EPA rated at 36 MPG

They also were commonly found in F Bodys from 76 and up.... but I do not see any reference to special MPG designated versions in them

except for that in 1979 a base package 225 equiped Sunrise/Duster option with the electronic lean burn/electronic Spark Control also were a high mileage design... generating 30+ MPG being possible in part high rear axle ratios of 3.21, 2.76, and 2.41

That said I really think it would depend on how it was driven. Driven easy no burn outs, no speed shifting, no slick shifting (reving engine til hitting right RPM then quick movement into gear without clutch use/racing shift Manuever), avoiding compression slow down when down shifting etc. Avoidance of these situations no problem...

But to be safe I would find a cast iron case or put the OD parts in the cast iron case...

The front bearing support area at front of trans is larger on OD so to use your bellhousing you need to have the hole machined to accept that larger hub not a big issue any machine shop can do it for you

Walt