OK, I have one valve cover off. There are no notches or markings on the ends of the shaft at all. I believe Buildanother said that only applied to small blocks. I guess I will pull the shaft next. Besides the oil hole facing down what else should I look for to verify the correct orientation of the shaft? I had it running for a while at an idle. There is plenty of oil puddled in the head so it must be oiling somewhat.