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Even on a small block chevy, which I'm very familiar with, one takes all the precautions possible. One is using a high quality paint, on the top of the heads and lifter valley, the other is porting around the return oil passages between the heads and the block. Looking at a typical oldsmobile head, I can see room for improvement with a porting tool.
One thing about the Olds engine. You have to keep that passage on the heads clear, especially on high mileage engines. Gunk seems to settle there, which would greatly limit how fast the oil can flow back down to the pan. Also, if you have an emissions (EGR equipped) engine, take great care, as these tend to create a good amount of carbon gunk between the intake and the lifter valley, which eventually finds its way to the oil pump pick up.
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