I have recently completed a project that seems relevant to this thread. My objective for my z432 tribute project was to as closely as possible replicate the z432 driving experience in a LHD configuration. I started with a '72 chassis which underwent a full rotisserie restoration. For the drive train I backdated a RB20det motor with Triple Mikuni's and dyno-tuned to 209 fwhp @ 8250rpm w/ 193 ft lb tq. The motor was mated to the RB20 5 speed and a R192 4.44 LSD. Brakes were changed to the MK63 calipers in the front. The most challenging part of the project was getting the 10k RPM tachometer to work with the electronic ignition system.
When the weather improves I'll post more pictures.