I got the pushrod side cover back on, adjusted the valves, and started the engine to see how she ran. Much better! It started easily and idled better than it ever has since I have owned it. I think at one time someone had adjusted the valves assuming the engine had solid lifters instead of hydraulics. That's the good news. Unfortunately, while the engine was running I noticed the oil being pumped to the lifters was not a nice dark black, but rather a muddy brown color. Right away I suspected a bad head gasket. I was about to go buy a new head gasket and tear into it, but then started thinking about it. I had checked the oil before and hadn't noticed any oil discoloration. So why all of a sudden would the head gasket be bad when I hadn't even been running the engine? During the past week while the valve cover was off the engine we had quite a few rain storms. Possibly, water ran through the hood holes where the hood ornament used to be, or maybe the vent cover drain (which has a broken hose) leaked water into the engine? So, I drained the oil and removed the oil pan since it was leaking around the old gasket anyways. After I pick up the oil pan gasket today I will put the pan back on, put a few quarts of new oil in, and run it again to see if I have any contamination. No sense in doing a new head gasket if there is a chance that rain water getting into the engine is the problem. Here is a pic of the nasty stuff I drained out. Yuck! Keeping my fingers crossed that I will not have to replace the head gasket!