400hp at 4000 rpms? let it spin a little bit more than that. work on making peak power in teh 5500 area. it is perfectly safe for your stock bottom end and it will be easier to make teh power.
the easiest thing to do would build a mild and reliable combo and then spray it.
vette heads would be a big help, comp cams has nitrous specific grinds available, and a plate system woudl top it all off nicely.
later
tim
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