Wow, thank god we don't have problems like this one here in USA, cause most of our corollas here are T models.
2tg is the best way to go mate ^_^. If you do this, I really think u need a te31 75-78 toyota corolla x-member so that the 2tg will just bolt right in. You would also need a t50 tranny up to the year 79. You can use a t50 tranny off of 80-83 toyota corolla too, but it will require cutting on the floor board for the shifter hole because it has moved about 2-3 inches to the rear.
I am building a 2tg/3t hybrid and expected to reach 500HP.