yeah i'll second donsjave on this especially if the vin# calls for a 304,thats probably whats in it,like he said they MAY have installed a 360 if that was in the dealer inventory at the time,but usually warranty requirements would require like motor to replace one in vehicle.any "changes" would be highly unlikely.i would't put too much stock in DMV paperwork as to engine size as they have no way to verify size,and at one time someone could have stated the size upon transfer of vehicle which got entered in system.one way you could find out is to check cylinder volume with motor oil if you could find out how much volume is held in a 304 vs a 360 but in reality just wait intill the time comes to rebuild it then you'll know for sure