Recently pulled the engine to do the transmission swap and inspected the lower end, replaced the oil pump and pickup since I had it out, and inspected bearings. I truly believe the odometer are real miles. Bearing end caps did not have marks indicating the engine has not been rebuilt. Oil pan gasket was original (and the reason I pulled it when I did the trans). Compression is around 130 +/- 5 on all 6 cylinders.