S30 was definitely designed for mas production - you can see that other then the L24 and the shell shape, its identical to the 510 and the 180b in terms of the basic building block and the component
This specifically includes the L24, which was in all aspects a basic engine, shared with every single nissan of the day
This is why I think the better comparison is the Alfa and the Fiat and not the Lotus/911.
i'm with HS30H in that, once again, if you look at the specs alone ( can't claim that I have driven one), not sure that an out of the box 2000GT would have much of an edge over the 240 with, say, the optional seiko wheels