The R34GTT box is the same as the R33 GTST one, i use them in most conversions as they are low mileage and it gives a little more headroom in the punishment area. We run shockproof in our boxes also. car makes over 300rwkw. I hate short shifters though and refuse to use them, a GTR shifter with the metal ball end is my pick for an improvement.
I also hate pull clutches so i fit push type GTR bellhousings to the GTT boxes.