Frank, I am using the HP2S bearings. Recall in my thread I had to remachine the Carrillo rods to accept the HP2S bearings as they were not the same notch as the R12S bearings.

remachined Carrillo rod to accept HP2S bottom end bearing
Dr. Curve, although 179 mph in full tuck sounds very appealling, I will be satisfied with the 168 that the stock gearing provides for my street purposes. If I ever head to Bonneville I will reach out!