ahoy subiemod! for those numbers you will definetly need meth at the min. possibly larger injectors and probably some bc "272's". also on that ppb page you'll notice that there is no description of the 20g other than "special sauce" and later in pauls description says it's a td06. i see your rockin a td05 with the 7cm2 housing. the other red herrring in that thread is paul posted in there stating it's basicly a factory freak as most td06 20g's on pauls dyno (dynojet fyi, but scv is slightly higher elevation) pull about 360-370. for 400 i'd say a dom 3.0xtr minimum.
i hope some of that was somewhat helpful.
are you tuning at hb? reason i ask is jeebus's dyno reads closer to a dynojet.