not quite , all the internals will still fit in your gearbox but your current hubs and synchros wont work , you will need newer ones but you can still use your gearbox case , transfer case etc , I think that 300000 yen will be what you should budget on including new selector hubs and syncros from nissan japan. the bearings you can get from anywhere , they are nothing special but try to get a good brand. It may be easier to get a destroyed R33 box and build that with new os giken internals , the hubs and synchros wont be too bad.
Brenhan.