I think that this forum in particular is not the place to ask that question- mainly because a lower % of the userbase here will have experience with the engines. Most of the users here are actually MUCH smarter than those on 240sx forums (I assumed the OP'd end up going there, so I was talking about those users).
From my experience, 240sx forums are good for general knowledge that one could get just looking at the specs of two engines. Beyond that, however, information is rarely found on said forums and is sometimes wrong. Hence, why I said to look it up instead of asking.
I'm not saying this to be a jackass. This is simply what I've seen and so I thought I'd try to spare him the headache of dealing with 240sx forums.