Been a long time since I've played with those but I think C33 twin cam is the same as A31, any reason you're not using the engine loom you had before? Engine side is pretty much the same except the cir clip type plugs on A31/C33 so could swap plugs or electrics to suit.
If you're going to go v8 or really any swap now with all the tax, I'd most likely just get rid of the car and start with something else. Unfortunately, I have a mate with a surplus of ls and Ferrari/Maserati v8's that's always tempting me FFS lol.
If you can get a clean, tested neo from Japan for $3500 these days, it's probably worth getting either way, hard not to be skeptical at that price.
Otherwise probably rebuild the s2.
The only R34 GTR I use is the GT500 so is RWD anyway, I might only get an hour a week to play it so haven't driven most of my cars.
Some of the time trials are pretty hard, I aim for silver, too slow for golds lol.
O disk doesn't have as much curve in the spokes to get around the caliper.
Pay to check on the work site but you'll see certain sizes and offsets available on each disk.
18x9 +22, 18x9.5 +24, they're on a c35, a mate had the same size on a 32 gtst, but needed more camber and guard work than the laurel, pic maybe not relevant haha
Thieving f****s, no updates so assume no news?
That's the problem with the Nissans, in NZ the cops rarely recover them, so they get away with it, mine is on storage insurance at the moment, still has a 5k excess.
Good luck man.
T67 25g 10cm would usually make 20 psi before 4k on a 25 although with a bit more compression and vct than you're running, td06h/sh 25g was usually around 300rpm later, t67 with 8cm was only marginally more responsive but down around 30kw up top.
Be surprising for the l2 to not be more responsive than sh especially on a rb20, although old news I'm wondering why the sh with the 20 comp haha, maybe the sh worked better with 8cm than l2 with 10cm.