If you get the RB, why not order some "just incase" extra replacement parts for the engine? As far as fitting it in there....I think I heard something about a custom crossmember and engine mounts. I have no idea about driveshaft tho. The people who do the RB swaps as a business ($$$<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='
'> are tight lipped about the specs..but Im sure there is someone out there who would help you out.
m