[Henry Schmidt]

Pete
People come here to get advice that will lead them on the best possible path to success.
Every time some want-a-be "engineer" with limited experience, recommends a half assed solution to a complicated dilemma, everyone loses. I evaluate every engine based on my experience. You can't always tell the viability of a part by measuring that part. That is why we send expensive parts like titanium rods to experts for non-destructive critical analysis. Bearings are cheap in the overall project cost of a Porsche rebuild so why risk a do over to save a few bucks. If the price is too high for you to do it right, maybe you should play in the kiddies sand-box
To answer you question again, there is no hard and fast rule but a quality new is always better than high mileage used part. "Better than new because it's tested" is what a conman says to sell his bull-shyt.