The 34 GT is somewhat of a mutt though, the 34 GTT brake stuff doesn't fit straight on. I've got 33 GTST calipers on mine, and from memory the GT uses a 12(I think) mm bolt same as the R33, whereas the GTT uses a 14(again from memory) mm bolt. So to fit the GTT stuff, you would need to drill out the holes. HOWEVER, I believe this even varies between early model GT's and late model GT's. Early models use the 12mm, late models use the 14mm.
In my case (1998, early model) the GTST calipers fit straight on. I went with HEL braided lines (for the sake of ~$100, why wouldn't you?) and upgraded the master cylinder at the same time as well. Definitely not hard. I would recommend just going and measuring your caliper bolt holes though.