No, just bolt it on; it has a windage tray and baffles and stuff built in. The one I run is #21016 which doesn't seem to be made anymore, but the 21017 looks to be the same pan, plus it will clear a 4" stroke.Are you running a scraper with the kick out pan?
Each engine has it's own "best configuration", so it's difficult to say without knowing exactly what you have and what it's use will be. We run a Billet Fabrication 2 piece pan in the race engine and the windage tray is basically a flat sheet of alumium with louvers in it that covers the entire width & length of the pan. The first tray we used was primarily just a screen type but this one yielded noticeable more HP.What style windage tray do you suggest? I've got a 468 going together and need to pick which pan, scraper, and tray to use.