I have a 1993 xlt, it says xlt special on the hood. The head cover on the motor is bare aluminum, never has been painted. Accorrding to the local dealer this motor is supposed to have individual o rings that seal the domes to the cylinder. When I dissasembed the motor, it had regular head gasket. the cylinder has holes for where the orings are supposed to fit. What is supposed to be in this motor for the dome gasket?