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You give up coil life for that 10-20% more spark. MSD's, Accel & Granatelli's are all the same. Stock COP's are plenty to handle most of what you can throw at it.
In one of the other 18 billion COP threads one of the more respected tuners (I cannot remember who) reported running well over 700HP with the stock COPs.
There's a good "sticky" about COPs at the top of this section...