Gentlemen,
The R33 engine manual is available to download free of charge from URL
http://www.qu4ck.com/nissan%20skyline%20r3...ce%20manual.pdf. This is the same version that you can buy from New Zealand which is the original Jap version translated to English.
It is 153Mb so you will need a high speed connection and probably software like FlashGet to speed up the download. I downloaded it on Friday 03/09/2004 so hopefully its still available.
Don't try opening this in the browser as it will take a very long time