I think you got ripped off. Sounds to me like you were sold an auto that was converted to 5 spd, which would explain the overdrive light and lack of a/c, and if so it wouldn't surprise me if the owner also lied about it being an SE when it is probably a base model (hence no power locks/windows). If you really want to be sure run a background check using vin either at DOT or carfax. As for a/c it was probably cut when the engine was swapped and you can check by looking for the compressor or the hose near the firewall (where it is usually chopped when an engine is removed). Hope this helps. Sorry if you did get cheated.