So it's just that easy right? Just slap on/drop in a V8 and BAM! Poof! It makes a car magically better?
If that was the case, how much more expensive do you think the 370z (wait....570z) would be?
I mean let's just forget about
: chassis design, balance, transmission, suspension, emissions, etc. etc. All these components would most likely need to be redesigned --> brand new car.
...the point is it's not as easy as just "dropping in" a larger engine. There are tremendous costs associated with such and if Nissan thought they could make a profit and undercut the Corvette in price while still delivering value, don't you think they would have done it already?
As for the last part, how long can Nissan hold off the competition? (I'm pretty sure in terms of performance, the competition aka 2011 Mustang GT has already surpassed the 370Z while at the same time being less expensive).