I am currently in the process of doing a complete restoration of my Early (no holes in frame horns)'67 Sub-frame. Today I was cleaning up the Power Steering box, so I have some #'s for you if you're interested. The car is an 11A (66) LOS built. It has (according to your report the correct; 5691676 casting. It has a 266 casting date, on the cover it has 276 6 (I believe that is actual build date?)(and would be 276 day of 66?) Which I believe would be correct for the 11A build date of the car? There is a 13 stamped under the 5691676, I'm not sure what that means. I hope this info. is helpful.