I have watched some of those Hot Rod shows on TV, where the host pre-fill a toruqe converter, but as mentioned only with about 3/4 of a quart of oil, then they installed the converter with the transmission laying on it's pan. I usually do not pre-fill the converter because I prefer to install a converter with the transmission standing up on it's tail. When a transmission is laying on it's side (i.e. pan) the pump gears can "SOMETIMES" (NOT ALWAYS) get cock-eyed and off center, which can stop the converter from locking all the way into the transmission. If you stand a transmission up on it's tail, the pump gears will fall flat against the back of the pump plate, thus keeping them from getting cock-eyed, and when the converter is spun in, with the gears flat against the pump back plate, the pump gears will self center, and allow the converter to lock in all the way.