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Late engine production '99 blocks received the reinforced #8 blocks, however there were a number of left over '99 engines used in 2000. The only sure way to know is to get the production casting off the right rear of the block.
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Ever consider the possibility there were more than ONE fix for the #8 cylinder problems!
Consider the first fix in 1999 as a "Band-Aid" type fix to the block casting to ensure continued 6.5L manufacturing to support AMG’s Military HMMWV/HUMVEE production as well as other applications AND to produce 6 engines for GM Powertrain (3 for durability and 3 for cold/hot cycle testing) to prove or disprove that first fix.