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I know just enough about air filters to be rated "challenged", but on most vintage military vehicles, the air filter is mounted away from the engine and uses a series of hoses and cross over tubes to connect to an air horn on the carberator. This not allows for snorkle and fording systems to operate, but provides a source of oil bath fresh air to the carb that is away from engine heat. Just FYI. Every vintage civilian car I've ever worked on has it mounted directly over the carb, so go figure. And, of course, the Model T had absolutely nothing to filter air unless it was after market.