Looks like for my purposes finding a 73-80 a/c unit would work the best. The truck has fresh motor and paint so I am not looking to tear it all apart. Although I just realized looking at some other pictures that heater only trucks don't have dash vents so I would need to find a dash or put some into the current dash. Maybe I need to see if i can find a used aftermarket under dash setup for cheap, that would probably be easiest.