I had them gapped at .035. I had a chip burned for it and it helped a lot.
www.detroitspeedworks.com did it for me. some people might remember Turbolx from this board? It is him.
His wide band is busted, so he gave me a "guess" chip and just took out 4.5% fuel @ WOT. When he gets his wide band fixed, i'll have it tuned on the dyno.