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You can use the stockers. You might have to periodically tighten them but they work fine. I went with stage8 locking header bolts. I say use stockers now and if you start to have leakage problems go with locking header bolts.
Most of the time the reason they start to leak at the flanges is cause of the flange being too thin. My kooks have never leaked with the stock bolts and lock washers i put on them.