As you can see there are many thoughts on moving the gas tank, but in the end it's what you feel best about that matters.
I, myself, removed the in-cab tank on my 1950 3600 and installed an RCI fuel cell at the rear between the frame rails.
Here's a pic:
http://i671.photobucket.com/albums/...0%20Chevy%20Truck%20Project/05030001.jpg