Your headers will likely NOT rub. That was an older problem that does not really existing anymore. In any case, the rubbing issue was really minor. When installed, the headers would not touch the shaft. However, under load, the engine would lean a little and the header would touch the shaft. It is easily corrected with a swift hit with a ballpeen hammer. When installed, just have your tech look and see how close the two are to each other. I would say that if they are closer than 1/2", then a "hammer mod" is in order. Otherwise, you should be fine.
Speaking of a pain in the a$$ install, Nismos are nothing. Try installing Crawford headers. Now that is a pain (x2 for me).