Definitaly a distillate tractor... I'll bet the hood has an extra hole in it on the mag/distributor side...
No particular benifit to having this set up, the manifold is most likely already set to the "cold" position for running on gasoline, since it has been many, many years since kero or distillate was cheaper than gasoline.
The drawback is that, even in the "cold" position, the manifold will be hotter than a gasoline manifold and you will lose a little bit of power from that (not much, though). Also, the head is most likely the low compression casting, which also costs some power (unless high compression pistons have been fitted). My head casting is 8776D which is one of the distillate numbers. Even with step-head pistons my compression is lower than if I would have had a gasoline head, but the power difference isn't that much.
As far as carb settings, you basically develop a feel for it. The idle screw should be set so it idles nicely and the high speed should be set just so that it doesn't throw any black smoke. Right or wrong, that's how I've always set mine... in light pulling situations you can also lean out the high speed jet just so it doesn't stumble when you throttle up.
A manual from binderbooks dot com would be an excellent investment.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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