8.2 10 bolt chevy is what you have. the 10 bolt 8.2 BUICK OLDS and PONTIAC top picture will have bolt in axle shafts. They are not bad rear to build BUT they are expensive...more expensive then the 8.5 . The 8.5 is a good choice for what ever you are doing.
We drag race the 8.5 and do a ton of custom work with the 8.5 rears, MANY out in the yards and they are strong. Jim