Check out this months ZOOM magazine (has a white EVO 5 lancer on the cover) there is a bloke with an ED XR6 with a Vortech V1 on it, STOCK BOTTOM END, EMS computer, intercooler, 2 speed Powergilde trannie (ohhhh the fuel bills!) who is cranking 221kw.........AT THE BLOODY WHEELS.
Anyway, back to the REAL world, there was a bloke called Sven (seriously....forgot his last name) who built a blue XF ute with 351 and twin Toyota blowers (i think they are the same as the ones ur looking at). It made a shit load of power. He also makes those twinlight conversion things for falcons. I think he has a bit of info on the ute at his web site
check it out!