its exactly what your V5 says! can't remeber if the V5 says if its an SE or not, but do you have all electrics etc etc? Its def not a sport as there is no such thing as a 320i sport...
Alloys TBH it could have had anything really, think by 1990 bottlecaps were standard, but it may have had options (even dealer fit ones) Are the wheels on it at present proper bmw ones? think "5 spoke softlines" where a dealer fit.
You can ask your dealer exactly what spec your car should/shouldn't have. Just need your Vin
Also see
http://www.e30zone.co.uk/modules.php?na ... nespec.htm
Think your car has been modded, had some aftermarket stuff put on, for instance the sideskirts, and possibly the rear spoiler.
Power to weight of an 320i is 110bhp/1000kg