My inner heater/AC box I ended up bolting straight to the firewall pad, seems to compress into it nicely.
For the rectangular opening with the two vent flaps to the inside duct work I used (as suggested in this thread) some 1" self adhesive expanding foam weather strip from Home Depot. It was sticky enough to make it in one piece running it around the corners, then any areas on the protruding plastic lip that I could get to I used 3m spray adhesive ... it's staying in place very well. It will compress quite small with a gentle sustained pressure .. so when you go to install the underdash ducts you just have to press it in for a few moments to allow the foam to compress before screwing it down.
Way better quality foam than that cheap Styrofoam looking stuff in the Ames kit. I'm betting Home Depot has this stuff in a variety of sizes that I'm going to use to replace as many of the seals as I can instead of the crap in the kit.
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