That is a beautiful 470 series 3 1/2 ton GMC truck, you have there. That chrome grille, chrome grille surround, and chrome bumper, are Awesome. All you need to do is lose that siren, and beacon light, and replace those fire truck running boards, with a pair of original big truck running boards, and it will be perfect. Is it air brakes, or hydraulic brakes ? There should be a "GMC Parts Identification " plate on the back of the glove box lid, listing the trucks specifications. I'm digging those Dayton wheels also. I own a 1952 GMC 470 series, 3 1/2 ton, Cabover engine truck. Yours should have the same 302 GMC 6 cylinder engine, as mine does.