The main things you'll need to change are:
-Larger fuel line -I took these out the same VX SS i purchased,so thats not an issue.
-Loom, pcm, bcm and keyhead - The engine harness i bought is from a WK statesman, i do have the VIN for it. and the computer is from the VX SS again, so i have the VIN for that too. BCM and Key i'll reuse mine (i will pair them, ive just bought a tech 2)
-Neutral safety switch. I couldn't find the loom i actually needed, which would probably be the same one you have (VY series 2 v8 with Traction control, so i bought one out of a late model 2003 WK which uses the early type transmission plugs for the start switch (same type the VX had on it). i want to put the VY Series 2 plug back on it as there easier to install/remove than the early type. initially when i stripped the VX i had to lower the trans to undo the top plug, im pretty sure it was stuck. I've got a plug out of a VY Series 2 wagon, already just gotta change them over on the loom. Also just so you know VZ v6 are the same plug but are pinned different and have 1 or 2 less wires in them. i made that mistake.
-ABS Module - got one a few weeks ago, out of a 2004 VY Berlina Ls1, with low k's
-LS1 fuel pump. bought a s/hand VY series 2 one, but have since bought a new Walbro one as i have a new bit's for the engine before it goes in
-V6 cluster -i have a WK Grange cluster in my VY so i'll program it back to v8 with tech 2
-Extractors - picked up a pair of Pacemakers a while back i quite good condition.
-Diff - I took the M80 out the VX SS, but have since had it rebuild, with 3.7 diff gears and a Eaton Trutrac. this will probably go in after the conversion, diff builder told me to not run it in while the cars on a dyno getting tuned
-Radiator - I've got a New VZ Manual Radiator and a pair of s/hand fans ready for it (VX SS ones were damaged)
-A/C lines and condenser. i managed to get a new a/c lines but they were $400. found them extremely had to find s/hand and were still $150-200 s/hand. will get a new condenser too at some stage (also damaged from the VX SS)
Power steering - i'll reuse my v6 one, i've got a new high pressure line and reco pump but everything else i have is from the VX SS or existing from my vy