I guess it depends on what style radio you have. If its and old style (shaft mount with knobs) then youd need to pull off the knobs, find the nuts behind them and remove the radio through the top of the glovebox.
If its not shaft mount, then it probably uses some sort of quick release, perhaps like similar vintage Ford products. On those there were 4 holes in the face of the radio, approximately 3/16" in the corners. If thats whats in your dash, 4 16 penny nails in the holes should release the los\cks and the radio should slide out.
Not sure if this helps or not, Andy