Caliper beyond repair?

So I'm converting my 69 Fury over to brakes from a 72 New Yorker. I figured I would do this while I'm doing the complete suspension rebuild. today with much effort and heat, I got the bleeders and the brake lines out of each caliper, so that's good. one caliper had a very stuck piston, which I finally got out. Unfortunately this is what I found inside. my opinion says that's beyond even honing. what's everybody else think for options?

IMG_20240309_183156409_HDR.jpg