I'm considering fitting a Heater from an Austin Mini (A rodders favourite) over here,it's a small self contained unit.This is on account of trying to get a decent heater core for my original unit. Mind you I don't think Mini heaters are thick on the ground in VA! My buddy in Newport News has one,but unfortunately he needs it for his '69 Mini!
I haven't quite got round to sizing things up,yet but my buddy had one in his '52 and it worked great!
I want to try and utilise the air intake on the right side of the cowl,which will involve a degree of fabrication. I don't think it'll be too much of a problem though!
Maybe someone else will 'chime' in with other suggestions?

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.