I think some of the Top Brass at GM know and understand 60's muscle better than you think. Tom Stephens the Vice Chairman of GM and former VP head of the Powertrain division ( engines and transmissions) is quite a car guy. Check out his garage and car collection.
http://ultimategarages.net/garages/t...ns_garage.html
You are correct that GM in very interested in making cars that will sell in todays market, as they should be. That's how they will stay in business. New Z28 Supercharged V8- sounds like they understand pretty well what people want.