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In terms of removing the parts, It's pretty straightforward. The A/C in my '81 had not worked in years when I bought it, and the whole matching numbers idea was long since scotched, so I took mine out. The firewall panel is optional, but the options you have are either to run around with the giant nonfunctional lump in your engine bay, or a hole in your firewall.
I'm going back with an aftermarket A/C system down the road a ways.