So I was driving on highway. Got into it a little then my RPMs drop to zero. I was doing well over 100mph. The car didn’t shut off on its own & didn’t hear tapping or knocking. Did see smoke from passenger side. Small white cloud. Once I cut it off she wouldn’t start back up. Low compression on passenger side and normal compression on driver side. It’s the LY7 3.6 dohc direct injection non interference. Just did motor swap under 6 months ago. Same type engine. Head gasket?? Timing chain?? Worse?