I actually like the cork gasket on the older style 20R/22R pans. They are usually flat though unlike the later model 22RE ones. I used the cork with that spray on copper looking stuff and so far no leaks.
On the later style with the dips in the flange I have used both grey and black permatex with success and the Toyota stuff a few times too.
I have found that whatever I use, I have a better seal if I wipe the mating surfaces down with acetone before application.
