First off I'd like to explane that the VH45 engine is destroked and used in the Indy cars as a Infiniti 35A engine, and thats what got me started. I got the headgaskets for both the VH & VK engine and compared them and other then a water hole was the same, but with different part numbers. The cams are alittle different and I really don't know if the'll interchange, but mine were custom ground and cost 'bout the same as VG30DETT cams and springs. They were ground with standard base circle diameter, and to run at 10,000+RPM.
I've installed ARP main studs and rod bollts along with head studs with "O" ringed heads. I have Wisco 10:1 pistons. The intake I'm having custom built like the VG engine, but with dual MAF's. I'll have to use a different computer as I have dual wideband O2's and Dual EGT's plus water temp. and a MSD igintion. The guy that helped with information thinks it well put out 550-600HP without any nitrous or supercharging. I have a 2 stage nitrous system, 1st stage 100 shot, and 2nd stage 300 shot. I hope this has what I'm looking for as I'm not really wanting to install a supercharger.
With this setup my Z32 should turn the 1/4 in the mid 10's @ 125MPH without nitrous, and with in the low 9's to high 8's @ 150MPH. That should make somewhat streetable. At last resort I'll install the supercharger with 12# boost and pickup a couple hundred extra HP. Right now everything is in limbo as I've neglected other things and trying to get caught up and back to my Z project. I'm using my 3" SS exhaust that was on the car, and a 1 piece drive shaft. From the transmission back it's stock, except the trans. is beefed up.
http://www.nissanperformancemag.com/may02/infinitiengine.php
http://www.badwojo.com/default.asp