I currently own all 4 years of the 240Z and a 1990 300ZX. The 70 is white, the 71 is Safari Gold, the 72 is Lemon Green, also have an orange 72 the 73 and 1990 are Silver. I recently added a 1996 white Acura NSX to the group.
If your cam is stock and he just did a clean up cut on your head, the stock .120 rockers are what you need. Maybe you ordered the wrong rockers……160, .170 or .180’s? .120’s are correct for what you described……
rem1313.....If you are using a 73 E88 head and only shaved .012 inches, you shouldn’t have any problems IMO. Those pistons are fly cut. If you use a cam with any more lift than .460, you would need to use a shorter valve seal.