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I've been making cardboard "blankets" for years. Sure there are probably better materials out there but the cardboard is free and it DOES work. You will notice much better heat retention when parked for a few hours, and that the noises from underhood are greatly quieted. You will now notice the Firebird has suddenly gotten noisier too. It might help some for retaining heat when using block heaters, but I don't know for sure. I'm also thinking it doesn't make much if any difference in fe or temps while going down the road.
On my cars cardboard is about all there is room for. On my F150 I used foil faced 1" foam- now that's a nice one!
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