Whatever you do, just don't "backdate" the truck. By that I mean, full wide whites with red steelies, etc. Nothing worse than a '60s car/truck done '50s style. Era-specific would be what I call "pinner" whites (1" whitewall) with either Radirs, Cragars, early Americans, or my favorite, chrome reverse with candy painted centers complete with spider caps. Body mods don't matter half as much as the paint--flake, candy, pearls, and of course the icing with cobwebb, lace, or fogged panels. Gotta have some angel hair somewhere too. Eddie Martinez-style Naugahyde--but diamond-tuft or pleated! There's plenty more, but the old magazines should serve you well for reference. Obviously, '60s custom is one of my favorite styles.