Well Street Speed, You can go with a lot of different set ups. You can go with the following motors:

CA18DET
SR20DET
KA24DET
RB20DET
RB25DET
RB26DET/RB26DETT
2J

and so on. It all depends on how much power you're trying to reach. As far as the suspension goes, go with Coilovers because springs straight up SUCK ASS. Get some 17" 5Zigen wheels, a roll cage, and a s15 front end and you'll be all set.

www.GA240SX.com is a GA site for 240sx....you're welcome to join