360 windage tray
Ok I've read this thread a couple times and thought I would put my two cents in. I'm not an oil control expert so take it for what its worth.
From what I understand the windage tray is not a baffle or a place for the oil to just sit around. The purpose is to keep the oil in the sump from getting hit with oil droplets off the crank that are going 100+++mph. When oil droplets from the crank get flung at the oil in the sump it creates a splash sending more oil into the rotating crank which causes drag. Also by the same effect when the oil gets flung into the sump it traps air in the oil in the sump. Air is not a lubricant. As far as I know this is the reason so many people(and factory) use it. The oil from the crank hits the tray then drips back into the sump not creating the bad effect. The hp only comes from the reduced drag on the crank from less oil splash.
As for the difference in 340 to 360 trays....the bolts holes are a different length apart and you may have to bent it in some places to clear the long stroke.