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i'd say maybe depending on tranny setup .. 340-365 rwhp.
what year is your car?
..from what i've heard, the best gains for the Fast 90mm intake & TB are from heads and cam .. not sure if it's worth it for a bone stock engine .. so if you're planning a heads and cam down the road .. you've got a good starting point.
if you're just going for the headers and intake .. I dont think you'll see much gain out of the 90mm over the ls6 w/ a P&Ped TB.
Sounds like your on the right track. However, to more appropriately compliment the addition of a new FAST manifold and TB (along with all the other great add on goodies you mentioned), why not add upgraded heads and cam to truly receive the benefit of the extra horsepower and torque you could achieve. This comprehensive mod would then provide you a very nice top engine rebuild/upgrade. Moreover, I would also add (if a daily commuter driver, etc.) new 3:73 rear gears which are now o.e. on the new C6 Z06. Lastly, it really looks like you are creating a great and fun project together. Let us know how it all turns out.
98 vert here. Headers and LS6 intake and Shaner TB went on at the same time in prep for the H/C that was just done. FAST 90 is a maybe down the road...Maybe. Little to be gained with the FAST until after H/C.