I don't think there will be that much difference in the cost between an L76 and LS3, the LS3 is not a hand built performance engine like some of the other special LS engines and can be mass produced very cost effectively. The truth of the matter is we really have no idea of whatengine choices will be offered, Scott Settlemire (Fbodfather) posted a while back to "forget everything we know about engines", perhaps indicating that none of the current engines will be in the new Camaro, time will tell what goes in them.
Clyde