Shaved and Filled Cowl Vents? Aftermarket AC

Anyone eliminate the vent opening in the cowl? Classic Auto Air AC System does not use outside air and blocks it off inside.
I'm thinking of eliminating the grated opening for the vents in the cowl. Smoothed out would look really nice and also eliminate a source for collecting crap or leaks.
Will fill the firewall holes too.
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The windshield washer jets would need to be moved but I think I can find late model little black ones like theses and mount them on the cowl.
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