NA is the way to go for endurance orientated racing. Just look at the GT cars in LeMans are stock cars in NASCAR (now there's 800 NA rwhp for you).
However, turbo applications can be made to work for endurance. Dakar is a great example. However, Dakar is so endurance oriented that insane horsepower isn't really the goal. The VW race toureg 2's only make 285 bhp. I should mention though, that they also make a whopping 443 lb-ft of torque that makes the power band nice and broad.
The best way to beat turbo lag is to just start with an engine that is suitable to begin with. By that I mean a V8! hehe. I've always been fond of turbo V6 applications.
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