Im not the slightest bit worried about the internals at this point. Stock honda civics can put 350 to the wheels on stock internals without exploding, srt-4's can do 400+, so im pretty sure these motors can handle 425-450 before you even remotely have to start worrying. Id say the single most important factor like any modded forced induction car...is the tune.

I too am curious how much further we can push the s/c, and still keep it reliable for us daily drivers.