This info is off of IPP's site under the 400+ cams, but in the quote it says R4+.
"The R4+ Cam set for the Nissan 300zx VG30 is an excellent choice for 450-650 Hp cars. These are 264 Deg/375" Lift with a +4 Degree advance on the exhaust cams. Must use JWT springs and the 90-93 cars will need the sprocket adapters."