When I turn on the heat in my 68', I'm lucky if the heat actually hits the window.The ducting is clean and sealed up good.I know the fan motor is old and probably doesn't conduct like it use to. So where is a place to get a new motor that really blows some air?

nothing wrong with the standard uap/napa replacement, they flow decent air, nothing like a new vehicle, but probably alot better than what you have. I drive my 68 (BBC) in up to -10(degrees centigrade) weather, and I stay warm enough, it'ld sweat ya out if your cab was remotely air tight (mine isn't)