Take into account Direct Injection, too. The engine compresses air-only for the most part of the compression cycle. Then the fuel cools the air charge as it enters the combustion chamber...Given that this thing pumps out 300+ hp on regular fuel at that CR -- there's definitely potential there.
Not that I'm any expert...but I expect this engine could take 'normal' (5-7psi) boost like other 'normal' engines without any significant risk. And at that level...tuned for premium, obviously, 400hp should be reachable.
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"Keep the faith." - Fbodfather
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