Much easier than stuffing a Cummins into an Art Deco nose like mine but still a very tight fit. Don't know about the AD's but as I recall, the war year trucks pretty much all had the same dimensions as far as the frames. I'm guessing you are looking at a 6BT, mine is a 4BT with the only difference being two more cylinders, so same width, just longer. I had to set my 4BT back almost two feet to get it into the frame because it gets narrower towards the front.
The Cummins swap is tricky, but I believe worth the effort as you can pull a house and still get surprisingly good mpg.
