I run a 14007 on both my SuperC (sleeved out to 131) and my BN (same, to 123), and they both do just fine.
I'd suggest that one over a carb you might find for a distillate motor. I have one of the latter sitting on the shelf (Zenith #12522, can't remember if it was sold as a distillate or a "universal" carb) and fit was a problem on the SuperC. The other reason I'd suggest it is that you really don't need the main jet screw running gas -- the idle mixture adjustment is sufficient.
As far as your radiator shutters. Your tractor may have originally been a distillate, in which case the shutters were pretty much standard on delivery. Still, your manifold and carb may have been changed out. The big clues there might be having the second/starting tank for gas, and also the part number on your head. My Super C has the original gas motor, but also has the shutters. The original owner was up in the Catskills and wanted them for operating in the cold weather. Even running on gas, those motors are cold-natured and take quite a while to heat up. I don't like shutting down a motor before it's had a chance to warm up (mine sits a lot and I like the idea of evaporating out any condensed water out of the oil), so I'll close the shutters at startup and open them after it's warmed up good.
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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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