L series electric water pump
http://www.thezstore.com/page/TZS/PROD/PCLC06/16-7025
I think VVT is on RB Neo Engines and maybe R34 RB25's (Series 2 RB25's)
Ask those RB questions on Skylines Australia, They should be able to give you definite answers
I am pretty sure is is the CAS sensor on the front of the engine that triggers the ignition on a RB engine. this sensor is mounted on the front of the passenger side cam.
I am not sure which bell housing would do that, have you looked at 180b's etc? If there is enough clearance with the tunnel and the starter motor bulge on the bell housing you might be able to modify your engine mounts and gearbox mount to suit.