I talked to Top-End today about the CV conversion. Steve said on the 70-73 240z, you need to get the diff, halfshafts and companion flange all from the 87-89 300zx turbo with the good LSD diff. He said it was a direct boltup. The shafts are shorter than the earlier N/A 300zx shafts and will work well. One thing to consider is to raise you diff a little. put a space between the front mount and the frame and either weld up the old holes on the moustache bar and drill new ones or cut down the surface where the moustace bar bolts to the frame.