Hey, I think you are in luck... I have a early 74 260z, but I did not have this problem, I just wanted to get rid of all those expensive parts. I installed the GM HEI Ignition Module and now my car runs like a dream and the module only cost $19 bucks. I got the info out of the archives in this here site...
If you cannot find it, e-mail me at home and I will send the directions to you.