Per your request I will "talk" about your carb. "carb accumulates gas at the base" leads me to guess that after it fires a few times but doesn't run, that gas is possibly running out somewhere. If my guess is correct this is a very common occurrence with old tractors. Most old tractors, like your H, have updraft carburetors. When cranked for a few seconds without starting a lot of gas will be sucked up into the manifold, and as soon as cranking stops this gas will be pulled back down by gravity. "I think primary jet is not drawing or clogged or something going on" tells me that you think that instead of gravity at work that the 1.5 inch passage through the carburetor to the manifold is blocked. This is highly unlikely. You can get a better idea of what is happening by taking a spark plug reading immediately after cranking. Just remove two plugs and look at them. If they are dry or just slightly moist you are not choking it enough. If they are truly wet you are getting gas to the cylinders but there is probably an ignition problem. Try this then post back. I see no evidence of a leak near the top. Be wary of applying silicone seal. it has lead to additional problems for guys making repairs.
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