The picture of the fan shroud is different than the truck one and looks like a car shroud of the same vintage. Also there are two mounts for the radiator. If you look in the lower frame crossmemember you can see them. You do need an original shroud or try to make one if you are handy. Also the location of the fan in relationship to the edge of the fan is critical. Usually just inside the edge. Without a shroud you just have a swirl effect with nothing really going anywhere. Someone mentioned a multiblade fan with more blades which is also a good idea. If everything is right you should run just a little over the thermostat you are running. Provided you don't have a caked up engine and some casting sand where it should not be . Kind doubt that and lean more toward the shroud/fan. Good luck.
