Thanks for the replies.
I am going the Sound Deadener Showdown route. It involves three steps: 25% coverage with deadener (Dynamat-like stick-on), 1/4" foam isolation barrier, then Mass Loaded Vinyl sheet (heavy 1 pound per square foot sound barrier).
I have limited work space, so after I pull the interior, I will do all the floors and side walls, and doors, then put the seats and carpets back in. If the sound is good I'm done. If not, I'll drop the headliner, and do the roof, before I reinstall the interior trim.
Dave