That stereo isn't mounted to the dash bezel but it might help to get it out, if I remember right the ashtray bolts are the only fasteners holding it in, only other ones would be just above the hvac controls. The rest of the attachment is spring clips, get your fingers behind the bezel on each side of the heater controls and pull sharply and it should come out, there's a couple by the heater vents too and around on the other side by the headlight switch, kinda have to bend it a bit to get past the flasher button.
The stereo would have come with some removal tools to get it out, usually some simple sheet metal things that go on the sides, might have to take off it's trim ring but you can usually get them out without that and maybe a butter knife on each side.