[Railroader]

I put Vintage Air System in my 63 C-10. It was only necessary to block fresh air vent on passenger side due to under dash unit on that side. I kept the vent on driver side. In Mississippi you don't need a lot of heat but if your unit is anywhere close to mine, the heat should be sufficient. I never use mine above the lowest setting. Just make sure you have good seal on ducts to windshield.