aftermarket heaters

anyone use an after market heater in there cars? I am looking into going this route with my 65 valiant. the cowl vents are rotted out on both sides. i am not going to pull the glass and take the entire cowl off the outside of the car to fix it. nor am i going to pull the dash. I am looking into sealing off the cowl vents and installing a simple aftermarket heater set up to only push air from the dash defrost vents. the car will be driven very often in the cold/rain. what are your thoughts?


this is a universal set up from summit. only $149.