Oh the fun of a 460 gas. Can't tell you a lot more from here but they can be a bugger. IH came with a zenith carburetor with a vacuum operated accelerator pump to over come the stumble on that tractor. Yours sounds like way over board though. If a quick pull on the choke while you gun it will get you up to speed I would say it is in the manifold heat riser. Like Vet already pointed out that stove inside gets full of carbon and then hot exhaust cannot circulate around the stove. Temporally tie the heat riser to the straight up position and see if that helps. If so, you need a new spring. To clean out the manifold you have to split it, those four bolts. There was some changes made in the carburetors, from double to single venturi which includes a different jet or two. Some times venturi's get changed but not the jets. Really hard to tell from here. I have drilled a quite a few main jets out for the ethanol fuel but that is a touchy job as you only go a few thousands of an inch at a time. Need it on a dyno or constant stationary load to do those kind of things.
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