I ran over 400rwhp on my stock 7m head for many many years with my HKS fcon vpc setup no problems. Not stock HG though.
Quickspool is going to be on my next order of items for sure as well. The only thing holding me back on that this year was that I didn't feel like redoing my downpipe since the QS raises the turbo outlet by about an 1" or so. I've also gotta get some 264 cams back in the motor, I really miss them. And I still have not picked and purchased a clutch, every time I am about to I hear a horror story about the one I settle on. Noise, premature failure, poor engagement, etc.
I was thinking HKS 264's again for cams, but have heard that there may be better now, GSC's I think?