3M 04274 NVH foam.
Comes in twin tube cartridge and requires special gun. Expensive, but works well. Squirt some in between panels, press down once to make sure both panels are touching foam, then let it sit in its normal until foam sets up.
This product doesn't expand so much that it will warp panels, but I think you should get it installed before starting any block sanding.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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