Ray, I don't know if you were able to figure out your situation but thought I'd respond just in case.
I don't think you need to worry about a possible overfill; here's the capacity specs for the 4.7l V-8 (from my manual - I too own a 2000 LC):
Oil capacity (drain and refill)
With filter = 6.8 qt.
Without filter = 6.4 qt
Recommended oil viscosity = 5W-30 SAE
I just picked up an oil filter the other day and they are surprisingly small for a V-8 but I did a visual comparrison of the one installed and sure enough...
... As for changing your own oil and where's that *darn* plug anyway???
The oil pan is protected by a skid plate. I've attached a file (MS-Word) where I've pasted some illustrations that shows the access covers you need to remove to get to the drain plug as well as the other cover for the oil filter which is located in the front of the vehicle on the drivers side. I couldn't paste them into this post so I had to attach it as a file.
Good luck!