Dart remove heater/a/c from the firewall Help!!!!

I'm doing a full restore on my Dart and I'm trying to remove the heater/a/c from the firewall. i removed all the nuts from the engine bay. unit is wiggly and loose but i can't seem to get it out with out damaging it. I'm trying not to damage it cause i need to send it to the refab shop to be rebuilt.

my question is there any nuts/bolts that hold it under the dash? i have removed all the ones that i can see. is there any trick or techinque i need to know to take it out?

thank you in advance for the help!