I'm not a fan of Vintage Air. Old Air Products uses the large round hole (gives you a neat grommet for it) and then also uses another hole to the right. Image attached of the last one I was installing. Good luck!

Edit...also Old Air Products gives you a block-off plate for the fresh air hole if you need it...along with very good instructions.
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Last edited by Jon G; 07/18/2024 8:31 PM.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end