Someone else may be able to give you more specifics on this but here it is...
89-90 240sx, chassis code - s13
2.4l SOHC I4 ~140hp ~145tq (not 100% on hp and tq)
Here's (http://community.webshots.com/photo/34531688/34532891tbHPOk) a nice looking one from 91blk240. Its a 91 DOHC model, but they look basically the same. I'm sure you already know what they look like and all but its still a nice pic to see <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>
Unfortionately I don't really know much more about s13's. Maybe someone can fill you in on the weight and a few other things. <a href="http://www.240sx.org" target='_blank'>http://www.240sx.org</a> has a lot of good info too, may want to check them out.