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Grill blocks mainly help to keep "unneeded" air out of the engine bay, and forcing it to stay outside. You only need enough airflow to the radiator to keep the engine at normal temps.... any more is a waste. Grill blocks can be made from a number of materials, basically whatever is available.
If you are looking to improve the FE in your truck...#1: stop driving it like its in the Daytona 500.... and then you can lower the truck, close up all the holes in the front, make a front air dam, install a switch to manually lock the torque converter, look into a tailed bed cover, etc etc.
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