not entirely sure on the logistics of oiling for VVTi, but it seems the oil feed is external standard. theres a big pipe coming from just under where the norm oil feed for a turbo is which goes up to the head.
i'm sure it won't require much more block alteration than what i'm already having to do for oil squirters, gen3/4 sump and AWD box fitment.
debating on whether i'll need new pistons or can modify my CP's. won't know until i pull the block apart i guess.
for your engine/car uses have you thought about a shot of NOS to bump the spool?
reason i chose vvti to compliment the seq turbo's is if i had 272's timed for top end it'd still be a pig to drive down low rpm even with the little gt2860.
hopefully i won't need such wild cams with the vvti to achieve a screamin topend rpm, also i can use much higher lift cams with the vvti heads than norm 3s.