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All 6.2's will work. The long block is the same. You would need to reuse any military parts that don't match the ones on the new engine. Even if you found a "C" series engine you can use your intake manifold to convert it to a "J".

If I was in your shoes I would cut the oil filter open. Look for metal debris. If you don't see any dip your finger in the oil from the filter and hold it up into the sunlight. Look for metal reflecting like glitter. If it's not much change the oil and filter and see if it runs. Since oil is...