Here is my favorite auger tractor. 5020 standard, dyno'd at 135. That is a 13" x 102' with 18 moisture corn, running about 8,000 bu/hr. It won't smoke if the corn is under 15%. Electric shut off on Rosa Master pump, Kee switch is reachable from the ground, PTO is on left side, 15' mechanical hand throttle cable is positioned on the swing hopper within easy reach when operating the trailer trap crank.
That 531 CID is great. If you idle the tractor down with corn still in the hopper it doesn't care. It will pull the full auger at idle. I also have a 4440, same horsepower but 466 CID turbo. It will die if throttled down with grain in the auger.