how to remove the ac box

[dancw88]

Hi all. I have a 69 roadrunner / satellite. I want to restore the ac heater box inside the car. How do i remove the heater ac box inside the car any help / photos on how would be appricated.

 

[69hemibeep]

There are 3 studs that go through the firewall with nuts and large captive washers on them that hold the box up A/C might have 4.