I think I may have a O2 seeing a lean condition on the left bank. I took 2 long logs to see how things would play out then I VEMaster'd teach run to the 2nd run to see if it changed anything.

 

Can O2 sensors cause this? I went from non heated to heated O2's and a DELTEQ igintion system. Didnt run like this before those items, and Wideband shows 14.2-14.5 at cruise and 13.1-12.7 at WOT. Wideband is in right pipe behind header collector.
I just looked at the plugs, all were a very light tan, with no indication of pre ignition, based on many years of looking at plugs and pretty pics on the net to help.
All the header gaskets are clean, as no evidence of exhaust leaks, no burn marks etc and headers are coated and I see no leaks that are evident.
The left O2 sensor, AC Delcos, was a tad, about a mm loose. I dont know if that is enough to cause a leak, but it was there.

 

Okay, Last try
Here they are in Excel.
http://www.mediafire.com/?35gzczdy222