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dang I was hoping you'd be able to squeeze a little more out of her, must be a stingy dyno...I agree with Carl tho, a ported fast will probably put you close to 460!
The new 102mm is the one you need. There is a supporting vendor on the forum selling them fairly cheap. It does not require any modifications to fit. I just did on ein my '05 after a cam install and picked up 19 and 21. You probably will not see the 25-35 hp gains some see with stock heads. Our LS2 heads suck!
This is prior to my cam, replaced my ported stock intake with a stock FAST (the older one which I assume they don't make anymore). All dyno's on a dynojet SAE corrected:
I've been using the 236XFI/236XER 114 and with trick flows its 505-515 depending on the other mods. FAST is mandatory.
This is the cam I plan on using coupled with a ported FAST TF 225's and a small shot of NOS. It should make serious HP. Spin specs some pretty sweet cams and he is extremely knowledgeable.