Do you really think that my response is that far off base?
Are the 2.7 and 2.8 being completely different animals when you consider that important homologations elements like the 2.7 RS suspension pickup points allowed the 2.8 RSR to use those setting in racing.
Also, we could get pedantic about replaced versus outlawed, but the point is that I doubt that many buyers back in the day could tell you the difference between valve angles or other such trivial detail. Instead, in terms of the question posed at the beginning of this thread and influence, I don't believe that it much of a stretch to think of the first 930 as the 73 RSR for the street.