finding the engine ID only tells you what you already know. it's a 4AC engine.
"I just want to know if it is AE86 or AE71?"
that is a body/chassis config designator. above and beyond a trim designation.
couldn't find anything on the AE71 config. but here info on the AE86 config,
http://en.wikipedia.org/wiki/AE86#Body_styles
if i'm not mistaken, should be, if it's still there, a sticker on the hood or in the bay telling you the chassis designation