"When I say don't look for hp in the oiling system I'm talking about super thin oils, old ss tricks of running low oil levels"
I wouldn't run super low levels, though you certaintly don't need to run it full most of the time. But if you switch all of your fluids over to Synthetic then it has been shown to give around 5 extra HP. Not a whole lot but it could make a difference in the outcome of a race. I'm actually an AMSOIL dealer and if you are interested in Synthetic oils you can visit
www.lubedealer/com/lgoil or just pm me. As for the windage tray. Your primary reason for getting large oil pan and windage tray should be to protect your engine. It keeps the oil down in the pickup for the pump. Horsepower gain should be an added benefit, though you might gain another 3 or 4 HP depending on the engine. The best oil system improvement you can make is obviously going to a dry sump system, though then we are getting out of the price range that began this post.