If the money is right you can do just about anything, but to be realistic...
CA18DET
SR20DET
KA24DE-T or KA24DE(T)....turbocharge the stock(USDM) engine
RB25DET
RB20DET
2JZ-GTE.....yes a Toyota engine in a Nissan
These engines have been placed in some model of the 240SX.
But seriously next time do a search..there's ALOT of info out there....probably too much for you to handle <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/dozingoff.gif" border="0" valign="absmiddle" alt='

'> ...j/k