Plenum removal
 

Still working on getting the dash out.
Next step calls for removing the plenum chamber. I've unhooked the defroster control, and removed 4 long hex screws holding the plenum against the firewall, but it's not budging. Is there something on the engine compartment side I have to disconnect, unscrew, unbolt, or otherwise deal with?

What year Bird are you working on? Sorry disregard. for some reason I thought I was in the Flairbird section.