Um, not sure why you want to do this.
Steve Zaloga and I looked at four different T-34 kits about six or seven years ago in the AMPS BORESIGHT. The winners were in order DML, Zvezda, Maquette/RPM, and last Tamiya. The Tamiya kits are over 30 years old and weren't very good to start with, but have remained popular as they are easy to assemble.
If you want to build a good T-34 76mm Model 1942 (hex turret) the best way to go right now is a DML T-34 Model 1941 with a Zvezda T-34 Model
1942 turret.You can't realistically convert a Tamiya T-34-85 to a T-34 76mm Model
1942.Cookie Sewell