Sounds like the fuel is not coming through the manifold to the cylinders. Could be a major vacuum leak as in a manifold gasket. Could also be a restriction in the intake system suck as a mouse nest, wasp nest, or even a shop towel that got drawn into the intake. Try a shot of carb cleaner or a spray of gas through the intake and see if it fires on that. If so, you need to look into why no fuel is getting into the cylinders. Strange things can go on with carburetors as well. Simple things like a venturi installed upside down so that it doesn't line up with fuel passages. Or a plugged or stuck needle and seat. Or even restricted exhaust.
Are you absolutely certain that the timing is close enough to run? Pull #1 plug and bring it up on compression. Rotor in distributor should point to #1 on the cap. Just having spark is not enough. It has to be at the right time as well.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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