I have restricted cam bearings in mine. However since building the engine I believe the consensus among most Olds engine builders is if you are going to restrict anything you're better off going with restricted pushrods, especially with hydraulic lifters.
I have the restricter's in my BBO and have had no problems. But I also have a larger oil pan a high volume oil pump and have modified the oil pump and pick up for more flow. All works pretty well together so far.
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