Here are some pictures of everything you will need for the conversion
This photo also includes a factory computer and harness to suit a Neo motor and also the tail shaft, which the auto versions should be ok to use instead.
This conversion kit was removed from a 2001 H13 Stagea 27,000ks
Photo is from Yahoo auctions and had a buy it now price of 300000 yen approx $3500
Notice the clutch master cylinder, no vacumn booster
Clutch and brake pedal brackets are different from a R33, not sure about R34
Not sure if the clutch is a pull or push type, being 2001 model and possibly the same box from a R33 it could be pull type?