Also, make sure it is not coming from the pressure sending unit. I ran into an issue with this last summer. I was having my oil changed at work one day and notice a slight seep from it. So, not know it was a pipe thread, I tightened it, and tightened it, and tightened it... I ended up cracking the oil filter adapter and it made the leak MUCH worse. Ford wanted around $500 for a new one and I couldn't find any used ones locally, so I ended up taking it to a speed shop and having a guy weld it up. Hasn't leaked since.
My Haynes manual calls for 15 to 22 ft lbs. That is on vehicles with an oil cooler (cobras) but I would think it to be the same. I don't think I even torqued mine. Just got them nice and snug and mine hasn't leaked since.
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Also I recommend getting the gasket from Tousley. None of the parts stores had it around here, and Tousley is way cheaper than the stealership, even with shipping. They were often faster in getting it too.