I was told by MSD that platinum plugs will definitely burn up quickly, but that copper (they suggested Champion) would be preferred.
It is pretty rediculous that they design the coils for plugs that were never meant to be in the car. Some people don't enjoy changing plugs every 10,000 miles. As I said before, the stock coils are fine, and seeing that there are plenty of W-Bodies w/L67'* that run 11'* and 12'* with the stock coils I think they supply plenty of spark, and you can use platinum plugs!!!