727 transmission gasket

Whats a good gasket to use that will seal good? I was thinkin dealer gasket part #02464324AC would you have to use rtv sealer with this? Does it fit good with the older late 60s 727? I though about gettin another good aftermarket gasket like felpro or mopar performance one etc and using that pertamex rtv that is specfically made for automatic transmission fluid.