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If you only cut off half of the tab and notch the block side of the other tab for a little more clearance, it sure makes it easier to find the stock setting again if need be.
It's actually a TSB for curing a bucking motor, fairly common in the early XJ's. From what I understand Jeep modified the cam grind and/or the cam gear index sometime in late 87 or early 88 (I really don't remember exactly).
It became a recommendation from many after market cam manufacturers, when they discovered there cam distributor index was off a little.
I subscribed to the TSB's and actually received the TSB's for all models of Jeep well into the Chrysler years.