A833 od 4 speed abuse

Back from the dead...
I have a '79 B100 with a stock teener 2-bbl and an A833OD that is original to the vehicle.
Since they made them this way, and since your car is a lot lighter than my van, you should be fine. I have also heard they put this trans behind the 360 2-bbl in F-Bodies when that engine was optional for those cars.
As was stated, these transmissions are not as stout as their cast iron non-OD counterparts, but they are very good, durable units.
IMHO, an aluminum A833OD is the trans for MPG in a Slant or stock teener that you plan on using as a daily, and not beating on too much.
Conversely, the original cast-iron A833 non-OD is the one to have behind a hot Slant or LA that you want to bang gears and burn rubber in.