What's an 833 o/d from a truck worth?

Some O/D 833s had the cast iron case. The one that came in my '75 Dart Sport slant six parts car was.
My opinion is that if you are going to try to be Ronnie Sox and drive it mercilessly with a lot of power in front of it, nothing will live for very long, not even a hemi 4 speed.
If you drove the car REASONABLY, a 440 with a 4 speed O/D and a 7 1/4'' rear would live if you keep the lube in good shape.
If you drive like an animal, nothing will last with severe abuse.
Geez guys, keep it in perspective........
As for value on the one you are looking at, $600 is way too much especially bare. More like $100 if it looks good inside.