good 5K or not???

I have been planning on putting a supercharger on my GT sence before I bought it. I finaly found a place to put it on (very hard to get work done in ND with Dyno papers). Any thoughts on the following... Procharger, 3 core intercooler, new fuel pump, 45lbs injectors, 75mm plentum, custom chip, dual A pillar gauge cluster with boost, and intercooler temp. This will all be Dyno tuned and profesionaly done. The guy claims 390rwhp if he tunes it down a bit. I'm going to have it tuned down, cuz I'd rather not have a rod break and I hear that 400hp mark would be the place.

current mods
BBK full length headers, BBK shorty X-pipe (no cats :) ), American Thunder cat back, BBK intake (gone with blower), BBK under drive pullies (gone with blower), BBK 75mm throtle body.
 
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