I like the idea of a smaller cube higher revving engine. That's the direction I went with. The intake and cam combination in my 5.7L LS1 should be good for hopefully 400HP+ at the wheels and turning to about 7K. Going by other folks that have used this cam there's no real loss in bottom end but big gains in mid range and top end.
Ms4 cam Trans Am dyno - YouTube
Cheers