Nice car. Well I do not have a 240. But I do have a straight stock RB25det off of a Nissan stagea 1997 43k off of clip. The only thing it is missing is that crappy stock turbo. I sold it. Comes with a rear sump custom pan, ecu, harness, greddy style intake polished, stock intake and mani as well. All you would need is a turbo of your choice. You could use the rear sump pan or sell it and get the stock pan for like 119 on ebay.
I was putting it in a 300zx but I just decided it is time for a newer car. If you like 300 check out mine. All you need to mount it with this engine is custom mounts or fab your own. Check out my auction it does have some nice upgrades that you could use or sell. Just an idea. A Z with a RB would be worth more than a 240. I also have the RB Bell housing to mount the RB tranny to the z transmission. Tran was rebuilt in 2005 only about 15 k since no shifting issues of any kind.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=320482851753&viewitem=&sspagename=STRK%3AMESELX%3AIT