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It's important to distinguish between a radiator block, and a grille block:
A grille block prevents excess airflow from entering the engine compartment in the first place, diverting it around the vehicle instead. Less airflow through the engine compartment should mean more retained heat under the hood and somewhat faster warm-ups.
A radiator block - something phyiscally against the front of the radiator - does not typically do this. There's little to no aerodynamic benefit in any of the cars I've looked at. (A car with full ducting from the grille to the radiator may be an exception, but they're rare to non-existant!)
A radiator block may also hamper the ability of the cooling fan to work, since it won't be able to move the same volume of air through the radiator if things get too hot. Fan air flow volumes aren't affected by a grille block (though the air that it's moving may be warmer).
I wouldn't bother at all with a radiator block. Grille block is the way to go.
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