My grandpa, many years ago, cut out the stock a/x unit out of my 71 slant 6 demon. Along with some coolant tubes flopping around the engine bay, the main problem is leafs and crap keep blowing into the cab. I know at one point there was an interior mount a/c controller under the dash. I tried moving the flaps on the vent things on the toekicks on each side up and down and hasnt made a difference. Any idea where or why this debris keeps blowing in and how to stop it?