Re: I believe I found the leak
When adjusting the valves, do yourself a favor and remove the spark plugs so that you can more easily and precisely hand crank the engine. If your engine has the original solid tappets, you won't be able to adjust the valves without removing them and grinding the ends. That means pulling the cylinder head. Hopefully your predecessor installed adjustable lifters, although given that he didn't even know enough to put in a rear main drain tube, I would suspect he didn't put in adjustable lifters. Either too cheap or too ignorant to have done so.
By the way, remove the dipper tray from the oil pan so that you can clean out the sludge on the bottom of the pan. It may be that the oil drain tube is trapped in goo down there. That's where I have found poorly-installed drain tubes in the past.
Marshall
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