Many good points were made already IMO. My one experience with the King brand is that they measure .0003" smaller than the Clevites of the same listed size. Also, the full-groove trench in the King bearing was wider than the comparable Clevite "p" bearing which, I didn't care for because IMO it compromises loading area on the bearing. If I remember correctly the King also had better concentricity (maintained its clearence further past the 12 & 6 o'clock positions). but hopefully someone else can verify this. Incidently, these are the only 2 options for a low-deck bearing AFAIK (another reason to oversize the mains) Lastly, I would size for the larger thrust bearing as well.