They also ran a Perkins in the early 60's W series for a few years. Most of them were the 500 and 600 series, but they did come from the factory in the one ton 300 series for a short time. When I was in high school one of my friends dads owned a salvage yard and there was a wrecked 63 or 64 (can't remember) W300 with a Perkins. My buddies dad held onto the truck and the title for several years with the intentions of finding a solid donor body to swap the drivetrain over to, but it never happened.