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My 82 suburban has a 2.8 geared rearend diff from a very old unnamed chevy car.
Many times (but not always) rearends are swappable from one chevy to another, even if they are 30 years apart with a small amount of effort (assuming they are the same size)
I was saying with a 6.2 you probably want a higher rearend than what would come in a typical 60's era car just because you would waste a lot of gas if your rpms are too high, it probably wouldn't hurt anything and you can even tune the 6.2 to deal with high RPMs fairly well but there is not point to have the gears needed for pulling stumps when the 6.2 in a car can get better fuel economy in the 1600-2200rpm range.
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