Here's a thread that might be of some help too. Edit: Added a picture from another forum
Heater box mounting problem
I have a 70 Challenger that the heater box is hanging down and the gasket on the passenger side is about 7/16 inch from touching. What I mean after installing it, it will not fit flush at the top of the car metal. It hangs almost like the weight of it pulls it down away from the cowl. Picture...
www.forebodiesonly.com
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