You could probably just install a CUCV radio bracket over top of it. You will have to cut the trim insert anyway to do so. As long as they didn't hack the original bracket under the dash pad which is used to bolt the radio bracket to. Either way, you could probably make it work easily and hide that abortion. I wouldn't sweat it but certainly use it as a price bargaining chip!
It sounds like you are looking to do a pretty "classic" setup with a lift and hummer tires. First, I would recommend a slightly shorter lift. Second, if you are doing the 37's then the stock 4.56 gears would be a better choice. Third, the 6.2 is cake to work on if you can read. So many people have issues with glow plugs or IP's. Don't jump to doing a 12v conversion or a gas 350 because you cannot learn the 24v 6.2 diesel setup. It works great for what it is. Fourth, good luck with your purchase. CUCV's rock!