here are some pics of e21
http://www.bmwinfo.com/23150.html
my father had a 1981 BMW e21 it is a great car but very fuel consuming, the best engine for it 323i , 2.3 i the one on 320 is a carburator engine 320i is injection of course, the following link is about specs
http://www.bmwinfo.com/23180.html