That combination gasket/windage tray has been on my last 2 builds. It is the way to go. Just for a little extra insurance, I spread Hylomar on it. No leaks AND it will come apart and go back together with no issues. That is with the repop Hemi/Six Pack pan. I have had them apart several times and they seal as good as new.

Besides, they are much easier to get into place than 2 gaskets, a tray, and a pan being twisted around the pick-up.