I got the following codes along with rough running after several days of rain.

P0300
P0302
P0308
P1316
P1111

I have not been able to find a diagram of the cylinder numbering, so I pulled and inspected all eight coils since I did not know which were which. My coils were the four pin type.

What I found was some oil in spark plug bosses for some cylinders indicating that the seals on the Cam Covers are leaking and also found that five of the ignition coils had cracks in the black plastic as seen in the photos.

I replaced all 8 coils and cleaned the oil from the spark plug bosses. The problems went away.

 

In case you need it in the future his is the number for the V-8.