Re: First square. 1980 GMC
Looks like the radio is held in by the two nuts on the tuner shafts and there looks like there is a silver metal strap from the back of the radio to the lower dash. There should be a plug on the back of the radio. That should get your radio out. As far as the floor, I would wire brush and then use some POR 15 paint on it.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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